Multicast group address a ff021 b ff021ff00200 c

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multicast group address? A. FF02::1 B. FF02::1:FF00:200 C. FF02::A D. FF02::2 Answer: CExplanation: FF02::A is an IPv6 link-local scope multicast addresses. This address is for all devices on a wirethat want to "talk" EIGRP with one another. Focusing specifically on FF02::A and how routers join it, we can see and say three things: ReferencE. -node-multicast/a/d-id/1315703 Answer: C,DExplanation: Suppose two routers are connected with each other via Fa0/0 interfaces and they are configured QUESTION NO: 182 EIGRP allows configuration of multiple MD5 keys for packet authentication to support easy rollover from an old key to a new key. Which two statements are true regarding the usage of multiple authentication keys? (Choose two.) A. Received packets are authenticated by the key with the smallest key ID. B. Sent packets are authenticated by all valid keys, which means that each packet is replicated as many times as the number of existing valid keys. C. Received packets are authenticated by any valid key that is chosen. D. Sent packets are authenticated by the key with the smallest key ID. Cisco 400-101 Exam "Pass Any Exam. Any Time." - 151
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to authenticate via MD5. Below is a simple configuration on both routers so that they will work: Router1(config)#key chain KeyChainR1Router1(config-keychain)#key 1 Router1(config-keychain-key)#key-string FirstKeyRouter1(config-keychain-key)#key 2Router1(config-keychain-key)#key-string SecondKey Router2(config)#key chain KeyChainR2Router2(config-keychain)#key 1Router2(config-keychain-key)#key-string FirstKeyRouter2(config-keychain-key)#key 2Router2(config-keychain-key)#key-string SecondKey Apply these key chains to R1 & R2: Router1(config)#interface fastEthernet 0/0 Router1(config-if)#ip authentication mode eigrp 1 md5Router1(config-if)#ip authentication key-chain eigrp 1 KeyChainR1 Router2(config)#interface fastEthernet 0/0Router2(config-if)#ip authentication mode eigrp 1md5Router2(config-if)#ip authentication key-chain eigrp 1 KeyChainR2 There are some rules to configure MD5 authentication with EIGRP: + The key chain nameson two routers do not have to match (in this case the name “KeyChainR1& “KeyChainR2 do not match)+ The key numberand key-stringon the two potential neighborsmust match (for example “key 1 & “key-string FirstKey” must match on “key 1 & “key-stringFirstKey” of neighboring router) Also some facts about MD5 authentication with EIGRP+ When sending EIGRP messages thelowest valid key number is used -> D is correct.+ When receving EIGRP messages all currentlyconfigured valid keys are verified but the lowest valid one will be used -> Although answer C doesnot totally mention like that but it is the most suitable answer because A and B are totally wrong. Answer A is not correct because we need valid key to authenticate. As mentioned above, although answer C is not totally correct but it puts some light on why answer
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