12-18-2012 04:42 PM. + = Permanent Entry. When downstream switches from the Root start receiving the BPDUs with the Topology Change (TC) bit set to 1, it will reduce the CAM tables aging timer from the default 300s to the current FWD_DELAY time (15s default). NB: Switches populate the cam table by looking at the source mac-address only. For any matching results, CAM will return the destination port (the associated content). . Next steps. In a MAC address flooding attack, the attacker fills the switch's Content Addressable Memory (CAM) table with invalid MAC addresses. 4. C. The tables are stored in content-addressable memory (CAM) and ternary content-addressable memory (TCAM). The MAC address table supports partial matches. 12. The CAM table. The address is located on port 3/2, and the switch makes a static entry in the CAM table for 01-00-5e-0a-0a-0a bounded to port 3/2. This table is called a Content Addressable Memory (CAM) table. MAC address so it appears to outdoor the MAC address that was registered by the ISP. A layer-2 switch does not know or care what layer-3 protocol is used inside the layer-2 frames. As of STP steps , it learns from which ports a mac-address arrives and populates its CAM TABLE( mac-address/port). TCAM is used to make Layer 2 forwarding decisions CAM is used to build. به زبان خیلی ساده. What does MAC flooding do? When an attacker tries to send a large number of invalid MAC addresses to the MAC table, this is known as MAC flooding. Case 1: Local. Figure 3-6 displays the typical CAM table population by a Cisco switch. The CAM and mac address-table semantics are often used interchangeably. g. 1 Default gateway 4. This CAM table overflow attack turns the switch into a hub, meaning it enables the attacker to see the traffic going in/out of the switch. CAM is most useful for building tables that search on exact matches such as MAC address tables. X. Compare the output with the results obtained by the procedure specified here. As a workaround, you can issue one of these commands in order to increase the CAM aging timer for the VLAN you are having trouble with to match the ARP aging time: For CatOS, issue the set cam agingtime command. Question #: 36. PVST+ uses 802. MAC address flooding exploits the memory and hardware limitations in a switch’s CAM table. CAM table stores mac address, port and associated vlan parameters. MAC C. When a switch is in this state, no more new MAC. This is possible as the tool sends huge amount of MAC entries per minute. Figure 14-1 CAM Table Operation A to B MAC A MAC B Port. Very seldom is it specified as the CAM table unless the distinction between CAM and TCAM needs to be made, or someone is teaching the subject. This fills in the switch’s CAM table, thus new MAC addresses can not be saved, and the switch starts to send all packets to all ports, so it starts to act as a hub, and thus we can monitor all traffic passing through it. 璿的筆記. So the only way to get the CAM table populated with all of the devices is to get all of the devices to talk. Packets that are sent on the Ethernet are always. The CAM is a specific type of hardware memory with a unique principle of operation and usage while MAC table is simply a data structure. Every switch has a pool of mac-addreses for internal allocation for its processes. CAM Table的全名是Content-addressable Memory Table，也就是大家所熟知的Mac table，主要是用於二層的網路通訊. If you specify an address but do not specify an interf ace, the address is deleted from all. ARP is used by a layer-3 device (host, router, etc. 4. A MAC address table is used by a layer-2 switch to relate the layer-2 address to the switch interface. Unicast media access control (MAC) addresses are learned to avoid flooding the packets to all the ports in a VLAN. If you have two networks, each with 100 devices on them, then the router has to learn, or remember, up to 200 MAC addresses. Layer-2 switches don't care about layer-3 or layer-3 addresses, so they don't use ARP, but they do care about which. Unless, of course, there was no activity from PC2 for five minutes and the MAC address was flushed from the CAM table but PC1 still has a valid entry in its ARP cache because four hours has not passed yet (default MAC and ARP. the only packets that are flooded are "empty" SYN packets (or more likely. There are three types of address; unicast, multicast and broadcast. A static ARP table contains entries that are user-configured. Even when I ping the cam table didnt update. So considerable number of incoming frames will be flooded at all ports. A sends packet to X with correct IP source address but incorrect source MAC address. It will lead the switch to enter into a fail-open mode. How to protect your network against MAC flooding attack. Switches will automatically populate the CAM table from framers that pass through the switch. Op · 7 yr. More about CAM over flow: CAM overflow. To avoid having duplicate CAM table entries during that time, a switch purges any existing entries for a MAC address that has just been learned on a different switch port. The memory operation is performed with a single operation instead of per entry. 01c then it looks that MAC address up in the CAM table. In the static option, we have to add the MAC addresses in the CAM table manually. The interface where we learned the MAC address. In this video, our expert instructor has explained concisely that: 1. Using a too large (even if its default) arp timeout means that the dist-router. Today is the difference between the CAM and TCAM. When looking up a prefix in a routing table, you don’t need an exact match, as long as the destination is contained within the prefix in the routing table, and that is where TCAM is used. Q :- What is the difference between Routing Table vs MAC Table?Answer :-MAC TableStands for Media Access Control, A MAC address table, sometimes called a Con. show ethernet-switching table The results show only interfaces for the Virtual Chassis master, although there are some ports connected on the VC slave. if you just start with what is already there I bet you will get most, if not all, of your devices. CAM simply refers to the way the switch uses memory (in a content-addresable) manner to look up the MAC address to. CAM is most useful for building tables that search on exact matches such as MAC address tables. The interface where we learned the MAC address. X. Indeed the FIB contain the best route selected from the RIB. The invalid MAC addresses are flooded into the source table. The CAM table stores a MAC entry by default is 300 seconds. 1. If the table does not already include the obtained address, it is added. how will be the lookup process in L3 switches. They definitely don't keep the same informations. switch(config)# mac-address-table static 12ab. I'm using "show mac-address-table" and "show ARP. " They have static that are programmed in on the alarm panel's side, not ours. Hello Dyep, the aging time is the timer that decides how long a non speaking MAC address is stored in the CAM table before purging it. The ARP cache contains entries that map IP addresses to MAC addresses. I did some research and it looks like that Catalyst series switches apparently have this command, "show CAM {MAC}" which is. Omada: how to view switch MAC address to port table? (aka CAM table) AlreadyInUse. TCAM stands for Ternary Content Addressable Memory. 9abc. The user wanting to. The router has a single table (CAM - content addressable memory) where it stores things like MAC address associations. If you do a show mac-address-table, you’ll see the CAM table — a table of MAC addresses that the switch knows; you would think that it would be empty since nothing’s plugge din, but the switch has its own MACs, so it always knows those guys. One Layer 2 exploit is a content-addressable memory (CAM) table flood, which allows an attacker to make a switch act like a hub. It is also known as associative memory or associative storage and compares input search data against a table of stored data, and returns the address of matching data. Second, the ASIC needs to perform table lookup in the MAC address table, so for fast table lookup, the switch uses a specialized type of memory to store the equivalent of the MAC address table: ternary content-addressable memory (TCAM). Improve this answer. CAM ( Content Adressable Memory) is a special kind of memory where you can implement your mac-address table. Routing Table D. That includes the frames used to negotiate the Spanning Tree Protocol. The MAC Address Table allows the. Share. The CAM table is empty until ingress traffic arrives at each port B. A switch can learn MAC address in two ways; statically or dynamically. 0101 which corresponds with multicast group 239. Synchronizing MAC address tables across switches doesn't make any sense. 3. 89ab comes into Switch 1 port 5. 2 Answers Sorted by: 14 MAC Table (Layer 2) The MAC table is used by the switch to map MAC Addresses to a specific interface on the switch. در سوییچ جدولی تحت عنوان MAC/CAM table وجود دارد که اطلاعات Mac address پورت های متصل به سوییچ در آن وجود دارد و ارسال packet ها درون شبکه را با استفاده از این table انجام میدهدMLS. When there is no matching entry in the MAC table, switches flood the frame out all interface/ports except the incoming interface or the one on which the frame was received. you are asking about ARP tables, and you're using OID . In an Ethernet switch, there is likely only one CAM table--the MAC table, so the terms have become somewhat interchangeable. Apr 27, 2021. 3b9. When queried, it will always return a binary answer; 0 for true or 1 for false. This attack focuses on the Content Addressable Memory (CAM) table, which stores information such as MAC addresses on a physical port along with the associated VLAN parameters. Edited by Admin February 16, 2020 at 5:05 AM. R1 wants to communicate with Host A. Does that mean, even if there is a MAC address in the. Here’s what the MAC address table looks like now: SW1#show mac address-table static | include Fa0. Flush CAM tables (this is different depending on the protocol, 802. Unicast frames are always forwarded regardless of the destination MAC address. It has to do this for every port. derek. The aging timer is used to identify how long a MAC address of a non-communicating device should be stored in the CAM table. The ARP timeout deals with the amount of time an ARP (layer-3 to layer-2 address resolution) entry remains in the ARP table before it is aged away. An ARP table is composed of devices’ IP and MAC addresses. From the command line, issue the appropriate command: CatOS devices: show cam dynamic. For example, for STP process, VTP process, switch assings the internal mac-addresses. A MAC table is probably a CAM table; not all CAM tables are MAC tables. By default, MAC addresses are learned dynamically from incoming frames. The ports are restricted and learn up to a maximum of 10 dynamically-learned addresses D. They do not contradict. Something most people don’t realize is that there is a limited amount of MAC addresses that a network switch can store in its MAC address table, and this can be exploited. When the switch receives a frame from Pc1, it associates the media access control (MAC) address of the sending network device (pc1) with the LAN port on which it was received. PC A : MAC Address a. 1. BASIS, and there were several types of each. What is a CAM Table Overflow Attack? A CAM table overflow attack is a hostile act performed against a network switch in which a flood of bogus MAC addresses is sent to the switch. In Cisco packet tracer, when I connect 2 switches together, the CAM table on each switch gives the MAC address of the switch port of the other switch. By default, MAC address learning is enabled on all interfaces and VLANs on the router. Command Modes Privileged EXEC (#) Command History Usage Guidelines If the clear mac address-table command is invoked with no options, all dynamic addresses are removed. The subnet on which Host A resides is a directly connected subnet. CAM table records the incoming packet's MAC address, Port & VLAN. ChristophW. - the arp table resolves what physical port/vlan on your local device traffic is exiting to reach the attached mac address and IP address of the desired device. These usually expire. Once CAM table is flooded, wireshark tool is used to capture the traffic in promiscuous mode. However, the ARP tables on the Nexus 7K Core switches do not get. The switch takes care of the incoming frame source MAC address and enters it into the CAM table and stays there at 300 seconds before aging out. An Ethernet switch in a switched network contains a CAM table that holds all of the MAC addresses of devices in the network. your assumption is correct, the arp entry is stale. With the help of this, we can add the IP address and MAC address to the ARP table (ARP cache). The command to look it up in almost all switches/devices is show mac-address table (or some form of this). Forwarding information base. Ajayamanna. TCAM stands for Ternary Content Addressable Memory. A CAM table uses entries to store. It involves overwhelming a switch’s MAC address table by flooding it with a massive amount of spoofed Ethernet frames, each containing a unique source MAC address. Following images shows a Switch's MAC address table before and after flooding attack. The CAM table provides a binary result for any query of 0 for true or 1 for false. With IGMP snooping, the switch intercepts IGMP messages from the host itself and updates its MAC table accordingly. If the destination MAC address isn't in its MAC address table (unknown unicast), it floods the frame to all ports, except the port on which the frame was received. I checked by logging into the Router. Since these attacks target switched LAN networks, let’s quickly examine how such a network generally works. 2. Host A receives the frame. 1. Like the OSI model specifies. ·. The switch makes a lookup in the dynamic CAM table to determine on which port the MAC address of the client PC is located. A CAM is often referred to as a binary CAM due to its ability to match only on 0's and 1's. Failopen mode: the switch starts behaving as a hub and broadcasts the incoming traffic through all the ports in the network. No it won't work. There’s not much to see here yet, though, since we haven’t hooked anything up to the. Fast-switching #2 is somewhat obsolete. A forwarding information base ( FIB ), also known as a forwarding table or MAC table, is most commonly used in network bridging, routing, and similar functions to find the proper output network interface controller to which the input interface should forward a packet. Good point. The below is output. -However you will get arp for the configured IP. Forwarding table is a L2 table which states for communicating with z. 2. Attackers exploit the MAC flooding technique to make a switch and act as a hub, allowing them to easily sniff traffic. That physical machine has two nics teamed and they trunk to this Cisco 3750. MAC Address Tables. Yes, but this might be platform dependent. 3. Yes the switch does know that ports 1 and 2 can not talk to ports 3 and 4 without something supplying routing. The CAM table function at this point is merely to direct traffic accordingly and be used as a. Be sure to subscribe and check out the rest of the series for the rest of the labs!Here is a link to the first v. The mac address or CAM table shows the Vlan associated with the port, MAC being learned on the port (i. Both ARP and MAC are 300s. 5e01. . 2. A switch has one cam table for all vlans. Hi,Ayub! There is a slight difference. It will configure the Cisco Fast and Easy Security feature. Introduction CAM (Content Addressable Memory) VS TCAM (Ternary Content Addressable Memory) CAM VS TCAM Multilayer switches forward frames and packets at wire speed by using ASIC hardware. Cisco IOS uses multiple techniques for L3 routing a packet in software: (1) process switching (2) fast switching and (3) CEF switching. CAM is most useful for building tables that search on exact matches such as MAC address tables. A topology change within a single VLAN (eg. ·. This flag is re-enabled whenever the switch receives a new packet from the corresponding MAC address, keeping active addresses in the table. Because the destination is not known, the switch forwards the frame out to all ports except the port through which the frame arrived. But if we're sending packets with bogus MAC addresses (even with a specified IP address), the packets are still spoofed. The CAM table, or content addressable memory table, is present in all switches for layer 2 switching. Layer 2 switches function and representative models. one active IP, one standby IP, each with its own underlying. 6. In more recent Cisco IOS versions, the syntax has changed to use the keywords mac address-table (first hyphen omitted). The MAC address table is contained in CAM, and ACL and QoS information is stored in TCAM. 4. On most network devices, the command is either. CAM (Content Addressable Memory) is specialised hardware that's used to store the MAC address table. As a workaround, you can issue one of these commands in order to increase the CAM aging timer for the VLAN you are having trouble with to match the ARP aging time: For CatOS, issue the set cam agingtime command. CAM table records the incoming packet's MAC address, Port & VLAN. So there is no need for a MAC Table I guess. See the article below :. Routing table is a L3 table which states for X. . Memoria CAM y TCAM. ARP timeout on the L3 device is set to 900 secs ( 15 mins) and that on the L2 switch is 1200 secs (20 mins). The MAC address is a unique 48-bit hardware identifier number assigned to the Ethernet interface of any host. The routing table is used to find out if a packet should be delivered locally, or routed to some network interface using a known gateway address. 6. 璿的筆記. MAC flooding. . MAC flooding bombards the switch with fake source MAC addresses until the CAM table is full. 7. The CAM table is used to store layer two information like: The source MAC address. تفاوت جدول MAC و جدول CAM در سویچ چیست؟. Mac address table overflow is a security vulnerability which attackers exploit by overflooding the CAM table to sniff the traffic. CAMs compare search data against a table of stored data and return the address of the matching data 1. Generally to find the IP address associated to a MAC Address, the easiest way is to look in the ARP tables. R2#show arp. The port of arrival and the VLAN are both recorded in the table, along with a timestamp. When you enable CAM table usage monitoring, the number of valid entries in the CAM table are counted and if the percentage of the CAM utilization is higher or equal to the specified threshold, a message is displayed. The CAM table is the primary table used to make Layer 2 forwarding decisions. However, if the CAM Key Topic 10/24/14 entry has timed out, the. As we can see, we have filled the CAM table and the switch has no place for new inputs. z router. However, the 4500 and 6500 continue to use mac-address-table. On the switchAs expected I see the end host(PC), plus IP phone MAC in the CAM table as a dynamic entry. Example: Switch-01#sh mac-address-table count . The switch sends out a frame to all forwarding ports within the respective VLAN when the destination MAC address is aged out from the CAM table. with default timers this means that that MAC address has been silent for more then 300 seconds (CAM aging time) and less then for 4 hours (ARP timeout), it is not a problem itself it can be an effect and not a cause. Set timeouts for entries in the dynamic MAC Table and configure the static MAC table here. Cisco switches perform MAC address table lookups with CAM memory exact match. VIDEO 14 in the GNS3 Labs for CCNA 200-301. The CAM table used by a switch deals with the MAC address to interface resolution. 123. From my understanding CAM is the Content−Addressable Memory which is available per port on the switch to speed up ethernet ID lookup. As frames arrive on switch ports, the source MAC addresses are learned and recorded in the CAM table. However, MAC refers to the contents, and CAM the type of memory. C. B. 2 - The SW adds A's MAC to the CAM table and floods the frame (But it doesn't change a thing) 3 - B receives the frame and responds to the ARP req with it's MAC. In order to do this, "Macof" command is run in the terminal. Fast-switching #2 is somewhat obsolete. Plus, a new change this year sees the 15 Pro Max get the most capable camera with the telephoto lens getting a 5x optical zoom. It will flood it out all ports except the receiving port of the frame. 1. Specific Layer 2 and Layer 3 components, such as routing tables or Access Control Lists (ACLs), are cached int. Otherwise, the CAM table entry for the end station will time out before the ARP entry times out, meaning that the FHRP device knows (from its ARP cache) the MAC address corresponding to the destination IP address, and therefore does not need to ARP for the MAC address. We would like to show you a description here but the site won’t allow us. R1 checks its ARP table to find out whether the Host A’s MAC address is known. Para evitar isso, desative a limpeza do MAC roteado com o comando de configuração global mac-address-table aging-time 0 routed-mac. MAC C. It is composed of the IP address and its MAC ADDRESS. •Common LAN switch attack is the MAC Address Table Flooding attack. The following image shows an example of the "show mac-address- table" command. The entry in the switch mac table has a timestamp and all records have a lifetime. 1 / 18. If an entry does exist, it will then examine the destination MAC address to see if it has an entry for it. The CAM table is the primary table used to make Layer 2 forwarding decisions. CAM Table Port 1 A Port 2 B Port 3 C. In new IOS. show arp. For example, if you have 1000 devices connected. By implementing router prefix lookup in TCAM, we are moving process of. There are two ways to add entries to the CAM table: static and dynamic. If a MAC address learned on one switch port has. This is called MAC flooding. These entries will be stored until. You also can configure static CAM table entries that contain MAC addresses that might not be learned otherwise. As the switch learns the relationship of ports to devices, it builds a table called a MAC address table, or content addressable memory (CAM) table. So, yes, there are multiple IP entries for the one MAC. CAM table stands for Content Addressable Memory The CAM tables stores information such as MAC addresses available on physical ports with their associated VLAN parameters. The ARP table is built from the replies to the ARP requests, recorded before a packet is sent on the network. The best example of this is when a switch needs to find a destination MAC address in a table in order to find the switch interface where the MAC address was last seen. Information like MAC addresses, the routing table, or access lists are stored in these ASICs. It is composed of the IP address and its MAC ADDRESS. The Adjacency table records IP address and Layer 2 header for the IP and then references the TCAM table and at this point the switch will have enough information to rewrite the packets headers and send them out the egress port. however, I think you're over thinking the problem. Ya that should be the case ideally. New addresses will then be learned. Then, repeat the CAM table process. MAC address filtering involves configuring a MAC address switch to only accept packets from known MAC addresses. Router prefix lookups happen in CAM. Apr 27, 2021. The maximum default time an entry will be kept on the table is 300. bikash-shaw asked a question. The switch enters these into the CAM table, and eventually the CAM table fills to capacity. If the DMAC is not known in the CAM table, the switch will flood it. z. When a switch is powered on, it doesn't know where each end device is located on the network. The Switch will not store the same MAC address on multiple ports. " A- Correct, therefore B incorrect As frames arrive on switch ports, the source MAC addresses are learned and recorded in the CAM table. O It will make the Ethernet interface on 0/1 faster. g. The FIB in a router perform the Data Plane, contrary to the RIB which perform Control Plane. If the SOURCE is unknown, the switch adds it to the table along with the physical port number the frame was received on. The memory operation is performed with a single operation instead of per entry. 255 (IP for layer 3 broadcasts). STEP2-. Disabling MAC Address Learning on an Interface or VLAN. 1w flushes out the MAC table almost instantly except MAC addresses on the port the BPDU was received on) Send BPDUs with the TC bit set (802. 361. Link. Mark as New;- [Instructor] The CAM or MAC address table on a switch maps the MAC address of a device to tne physical switch port. To build the CAM table or make entries in the CAM table, the switch uses the source MAC address field of the incoming frames. 2. You cannot configure separate MAC table aging times for specific VLANs. In switches, CAM tables store the MAC addresses for different devices on its ports. Copy. 3. Hi, ARP gets the MAC address of a host or node and creates a local db that maps the MAC address to the hosts IP address. Improve this answer. Cuando se utiliza TCAM - Ternary Content Addressable Memory dentro de los routers L3, se utiliza para realizar una búsqueda de direcciones más rápida que permita un enrutamiento rápido. CAM (Content Addressable Memory) is specialised hardware that's used to store the MAC address table. the Switch performs Routing lookup to determine the next hop Ip address and the destination Mac address. However if I check the CAM table when the server is. The data frames are sent over the network. bbbb was missing, I have exported ARP and CAM tables from both switches. If you use this command just after turning on the switch, it displays a blank CAM table. A router can operate as a switch. Layer-2 switches don't care about layer-3 or layer-3 addresses, so they don't use ARP, but they do care about which. This switch is responsible for keeping track of which device is connected to each port by maintaining a table called the “MAC Address Table”, which. Switch then acts as a hub by broadcasting packets to all machines on the network and attackers can sniff the traffic easily. What is a Routing Table? 3. Cause 3: Forwarding Table Overflow. That lens is limited to 3x for 15. Reply. If you do a show mac-address-table, you’ll see the CAM table — a table of MAC addresses that the switch knows; you would think that it would be empty since nothing’s plugge din, but the switch has its own MACs, so it always knows those guys. X. Packets or frames are forwarded by looking up the destination MAC address in the switching table. Add a comment. Here are the basic rules that a switch uses to carry out the frame forwarding responsibility: If the destination MAC address is found in the CAM table, the switch sends the frame out the port that is associated with. The CAM can store MAC table and many other kinds of data - it is not limited to pure MAC addresses. It's easy to get them mixed up, as they have similar names. 4. TCAM is used to make L2 forwarding decisions. Adjacency table : The adjacency table is constructed at the same time as the RIB is populate using the ip of the next hop and ARP for L3 to L2 mapping to translate the ip to their corresponding layer 2 address. Switch's MAC address table has only a limited amount of memory. A CAM table is the same thing as a MAC address table. or does it get flooded to all connected ports due to the empty MAC Address table. The attack works by forcing legitimate MAC table contents out of the switch and forcing a unicast flooding behavior potentially sending sensitive information to portions of the network where. Look at the switch port shown in the entry and move to the neighboring switch connected to that port. A MAC Address Table (MAT), also known as a Content Addressable Memory (CAM) table, is a database stored in a network switch that lists the MAC addresses of all the devices connected to the switch. z router, send packets to MAC Address aa:bb:cc:dd:ee:ff. Switching table is a Layer 2 table while the Routing Table is a Layer 3 table. You examine this on your layer 3 device. But I have a physical machine hosting some vms. It tells the switch which port to forward frames given a specific MAC address. The ARP timeout deals with the amount of time an ARP (layer-3 to layer-2 address resolution) entry remains in the ARP table before it is aged away. The switch is going to ARP for that destination IP to get it's MAC address (which would also populate the CAM table with the response). The switch enters these into the CAM table, and eventually the CAM table fills to capacity. Layer 2 switches have a MAC address table timeout or CAM aging timer which Cisco sets for 300 seconds by default. the CAM table is the table where the associations MAC address, Vlan, port are stored. 1. In the case of Layer 2. 4. MAC address table, also known as Content Addressable Memory (CAM) table is a table that switches use to forward packets at layer 2. 17. MAC address table lookups happen in TCAM. CAM stands for Content Addressable Memory. 1 / 18. When the router receives a packet, then the router would have to lookup its ARP table to find the appropriate MAC that corresponds to the IP address to create the frame to send off to the switch. This happens when a switch receives a frame with a destination mac address it does not have in the CAM table. Switches dynamically learn MAC addresses of each connecting CAM table. When the MAC table's designated limit is reached, the legitimate MAC addresses begin to be removed. A switch can learn MAC addresses in two ways; statically or dynamically. Beginner Options 11-15-2020 09:41 AM - edited 11-23-2021 02:17 PM Any network connection is a logical connection between two endpoints. Cuando se utiliza TCAM - Ternary Content Addressable Memory dentro de los routers L3, se utiliza para realizar una búsqueda de direcciones más rápida que permita un enrutamiento rápido. Study with Quizlet and memorize flashcards containing terms like 1. A "CAM table" tells you what is the technical nature of this table - a content-addressable memory, or a cache, that performs parallel and fast lookups. There is a source endpoint and a destination endpoint with two separate. On a Cisco switch you can view the CAM table (MAC address table) by issuing the "show mac address-table" command.