What is the benefit of using TCAM for IP forwarding decisions versus using the CAM table?
What is the benefit of using TCAM for IP forwarding decisions versus using the CAM table?
TCAM (Ternary Content Addressable Memory) supports matching based on masks, allowing for ternary (three-state) matching that can handle exact values as well as wildcard masks. This capability makes TCAM particularly efficient for routing lookups, where variable-length prefixes (subnets) are involved. On the other hand, CAM (Content Addressable Memory) performs exact matching based on binary values and does not support wildcard masks, making it less suitable for forwarding decisions in scenarios involving variable-length subnet masks.
The benefit of using TCAM (Ternary Content Addressable Memory) for IP forwarding decisions is that TCAM allows for matching based on masks. TCAM can perform ternary (three-state) matching, which means it can match on exact values as well as wildcard masks. This capability is particularly useful for routing lookups where variable-length prefixes (subnets) are involved. TCAM is efficient for performing lookups based on both exact matches and prefix matches, making it well-suited for forwarding decisions in routers where variable-length subnet masks are common. On the other hand, CAM (Content Addressable Memory), typically used in traditional MAC address tables, performs exact matching and doesn't support wildcard masks for variable-length matches like TCAM does.
CAM can only search on exact matches of binary strings. TCAM, for its part, searches the memory to match the key, like CAM, and can also use a mask to indicate "don't care" or wildcard bits. This results in three possible states: 0, 1 and X, a wildcard. Using mask bits allows for much more flexibility in searching
CAM -exact matches -ones and zeros (binary) -layer 2 TCAM -VMR (Value, Mask and Result) -layer 3 https://community.cisco.com/t5/networking-knowledge-base/cam-content-addressable-memory-vs-tcam-ternary-content/ta-p/3107938
B should be correct The problem with CAM is that it can only do exact matches on ones and zeros (binary CAMs) https://community.cisco.com/t5/networking-knowledge-base/cam-content-addressable-memory-vs-tcam-ternary-content/ta-p/3107938 By implementing router prefix lookup in TCAM, we are moving process of Forwarding Information Base lookup from software to hardware. https://howdoesinternetwork.com/2015/tcam-memory
answer = C https://community.cisco.com/t5/networking-knowledge-base/cam-content-addressable-memory-vs-tcam-ternary-content/ta-p/3107938
Correct answer C. Check this link: https://learningnetwork.cisco.com/s/article/tcam-demystified#:~:text=TCAM%20entries%20are%20organized%20by,fast%20operation%20of%20the%20TCAM.
i will go for C
https://community.cisco.com/t5/documentos-routing-y-switching/uso-de-memoria-tcam-y-cam-en-los-routers-y-switchs/ta-p/4536017