400-101 Exam Dumps | EIGRP allows configuration of multiple MD5 keys for packet authentication to support easy rollover from

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Question 468/498

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.

Correct Answer: C,D

Explanation/Reference:
Explanation:
Suppose two routers are connected with each other via Fa0/0 interfaces and they are configured to authenticate via MD5. Below is a simple configuration on both routers so that they will work:
Router1(config)#key chain KeyChainR1
Router1(config-keychain)#key 1
Router1(config-keychain- key)#key-string FirstKey
Router1(config-keychain-key)#key 2
Router1(config-keychain-key)#key-string SecondKey
Router2(config)#key chain KeyChainR2
Router2(config-keychain)#key 1
Router2(config-keychain- key)#key-string FirstKey
Router2(config-keychain-key)#key 2
Router2(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 md5
Router1(config-if)#ip authentication key-chain eigrp 1 KeyChainR1
Router2(config)#interface fastEthernet 0/0
Router2(config-if)#ip authentication mode eigrp 1 md5
Router2(config-if)#ip authentication key-chain eigrp 1 KeyChainR2
There are some rules to configure MD5 authentication with EIGRP:
+
"
(
The key chain names on two routers do not have to match (in this case the name "KeyChainR1 & KeyChainR2 do not match)+ The key number and key-string on the two potential neighbors must match for example "key 1 & "key-string FirstKey" must match on "key 1 & "key-string FirstKey" of neighboring router) Also some facts about MD5 authentication with EIGRP+ When sending EIGRP messages the lowest valid key number is used -> D is correct.+ When receving EIGRP messages all currently configured valid keys are verified but the lowest valid one will be used -> Although answer C does not 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 B is not correct: each packet is NOT "replicated as many times as the number of existing valid keys". All currently configured valid keys are verified but the lowest valid one will be used.

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Why is the neighbor relationship betwe...; Question 372: Refer to the exhibit. Which additional information must you ...; Question 373: Refer to the exhibit. R3 is failing to join the multicast gr...; Question 374: MPLS LDP IGP synchronization is configured on a link. The OS...; Question 375: What is a cause for unicast flooding?...; Question 376: Which two statements are characteristics of Ethernet private...; Question 377: Which two events occur when a packet is decapsulated in a GR...; Question 378: Refer to the exhibit. NHRP registration is failing; what mig...; Question 379: Which two statements about the default SNMP configuration ar...; Question 380: Which type of OSPF packet is an OSPF link state update packe...; Question 381: Which three capabilities are provided by MLD snooping? (Choo...; Question 382: Refer to the exhibit. Why is the prefix 1.1.1.1/32 not prese...; Question 383: Refer to the exhibit. A PE router is configured with a polic...; Question 384: Which two solutions can reduce UDP latency? (Choose two.)...; Question 385: Refer to the exhibit. Which two statements about the output ...; Question 386: What is the hop limit for an MLD message?...; Question 387: Which command enables L2 QoS support in all VLANs (including...; Question 388: Refer to the exhibit. Which statement is true?...; Question 389: Refer to the exhibit. What is the role of this multicast rou...; Question 390: Which three options are components of an EEM CLI policy? (Ch...; Question 391: Which two statements about logging are true? (Choose two.)...; Question 392: Which protocol is the encapsulating protocol for mtrace pack...; Question 393: What is the destination multicast MAC address for BPDUs on t...; Question 394: Refer to the exhibit. Which two statements about this config...; Question 395: Which three statements about Cisco HDLC are true? (Choose th...; Question 396: Refer to the exhibit. How can Router X in AS70000 peer with ...; Question 397: You are installing a new device to replace a device that fai...; Question 398: Refer to the exhibit. Routers R1, R2, and R3 are configured ...; Question 399: Refer to the exhibit. Which statement is true?...; Question 400: Refer to the exhibit. Why is network 172.16.1.0/24 not insta...; Question 401: Which bit should be set in the link-state PDU of an IS-IS L1...; Question 402: Which address is a MAC address that is mapped from an IPv6 a...; Question 403: Which option is an incorrect design consideration when deplo...; Question 404: Which three statements are functions that are performed by I...; Question 405: Refer to the exhibit. Which two statements about the impleme...; Question 406: Which statement describes the native VLAN concept in an ISL ...; Question 407: Which statement about the OSPF Loop-Free Alternate feature i...; Question 408: Which two statements about the protected ports feature and t...; Question 409: Which three statements about implementing a NAT application ...; Question 410: Which problem can result when private AS numbers are include...; Question 411: Refer to the exhibit. Which additional configuration is nece...; Question 412: Refer to the exhibit. R2 is mutually redistributing between ...; Question 413: Which two features improve BGP convergence? (Choose two.)...; Question 414: Refer to the exhibit. Why is the router not accessible via T...; Question 415: Refer to the exhibit. Which two statements about this route ...; Question 416: Refer to the exhibit. Which two are causes of output queue d...; Question 417: Where is multicast traffic sent, when it is originated from ...; Question 418: Which two values comprise the VPN ID for an MPLS VPN? (Choos...; Question 419: Which implementation can cause packet loss when the network ...; Question 420: Which measure does ISIS use to avoid sending traffic with a ...; Question 421: Which option is the default maximum age of the MAC address t...; Question 422: Which statement about BGP and diverse path advertisement is ...; Question 423: Which two options are reasons for TCP starvation? (Choose tw...; Question 424: Refer to the exhibit. Which action must you take to enable f...; Question 425: A company is multihomed to several Internet providers using ...; Question 426: In the DiffServ model, which class represents the highest pr...; Question 427: Which regular expression will only allow prefixes that origi...; Question 428: Which statement is true when using a VLAN ID from the extend...; Question 429: Refer to the exhibit. You have configured two routing protoc...; Question 430: Refer to the exhibit. Route exchange is failing on a PE edge...; Question 431: Which two events occur when a packet is decapsulated in a GR...; Question 432: Which set of commands conditionally advertises 172.16.0.0/24...; Question 433: Which three statements about the route preference of IS-IS a...; Question 434: Which three conditions can cause excessive unicast flooding?...; Question 435: Refer to the exhibit. R1 is performing mutual redistribution...; Question 436: In which two modes do IPv6-in-IPv4 tunnels operate? (Choose ...; Question 437: Which two statements are true about VPLS? (Choose two.)...; Question 438: Which data plane protocol does EIGRP Over the Top use?...; Question 439: Which command do you use to connect a dense-mode domain to a...; Question 440: Refer to the exhibit. Which option explains why the forwardi...; Question 441: Which three routing protocols utilize TLVs? (Choose three.)...; Question 442: Which two options are advantages of NetFlow version 9 over N...; Question 443: Where should the passive-interface command be used?...; Question 444: Which two statements are true about a 6to4 tunnel connecting...; Question 445: Which statement is true about VPLS?...; Question 446: Two routers are trying to establish an OSPFv3 adjacency over...; Question 447: Refer to the exhibit. What is a possible reason for the IPSE...; Question 448: Which two tunneling techniques determine the IPv4 destinatio...; Question 449: Which two options are valid for the number of bytes in a BGP...; Question 450: Which flag in a configuration BPDU instructs all switches to...; Question 451: Refer to the exhibit. Which configuration is missing that wo...; Question 452: Which technology is an application of MSDP, and provides loa...; Question 453: Which three actions are required when configuring NAT-PT? (C...; Question 454: Which circumstance can cause packet loss due to a microburst...; Question 455: Refer to the exhibit. The device with this configuration is ...; Question 456: Which two statements about the ipv6 ospf authentication comm...; Question 457: In an STP domain, which two statements are true for a nonroo...; Question 458: Which two statements about OSPF route types are true? (Choos...; Question 459: Which three statements about VTP version 3 are true? (Choose...; Question 460: A service provider is deploying L2VPN LAN services in its MP...; Question 461: What are the minimal configuration steps that are required t...; Question 462: Refer to the exhibit. If the remaining configuration uses de...; Question 463: What is the main component of Unified MPLS?...; Question 464: Refer to the exhibit. Why is the router out of memory?...; Question 465: Which two statements are true about IS-IS? (Choose two.)...; Question 466: Refer to the exhibit. Which IP packets will be accepted from...; Question 467: If two OSPF type 3 prefixes have the same metric, and are wi...; Question 468: EIGRP allows configuration of multiple MD5 keys for packet a...; Question 469: Which variable in an EEM applet is set when you use the sync...; Question 470: Which statement about WAN Ethernet Services is true?...; Question 471: Refer to the exhibit. Which statement about the device routi...; Question 472: Which statement is true about IGMP?...; Question 473: Refer to the exhibit. You must complete the configuration on...; Question 474: Which statement describes the function of the tracking objec...; Question 475: When BGP route reflectors are used, which attribute ensures ...; Question 476: Which service is disabled by the no service tcp-small-server...; Question 477: Refer to the exhibit. Which two statements about the EEM app...; Question 478: Which two statements about HSRP are true? (Choose two.)...; Question 479: A configuration includes the line ip nbar port-map SSH tcp 2...; Question 480: Which two features are used for inspection when IPv6 address...; Question 481: Refer to the exhibit. Which statement about this COS-DSCP ma...; Question 482: Which two protocols are not protected in an edge router by u...; Question 483: Which field is specific to the OPSFv3 packet header, as oppo...; Question 484: When you configure the ip pmtu command under an L2TPv3 pseud...; Question 485: Refer to the exhibit. Which three statements about the outpu...; Question 486: What are the three primary components of NetFlow? (Choose th...; Question 487: Which two mechanisms provide Cisco IOS XE Software with cont...; Question 488: Which three roles does a key server perform when used with G...; Question 489: Which Carrier Ethernet service supports the multiplexing of ...; Question 490: Which statement is true regarding UDLD and STP timers?...; Question 491: Which two options are the two main phases of PPPoE? (Choose ...; Question 492: Which two statements about packet fragmentation on an IPv6 n...; Question 493: Refer to the exhibit. Which statement describes the effect o...; Question 494: Which technology facilitates neighbor IP address resolution ...; Question 495: What is the ip dhcp snooping information option command used...; Question 496: Refer to the exhibit. If ISIS is configured utilizing defaul...; Question 497: Which two functions are performed by the DR in OSPF? (Choose...; Question 498: Which authentication method does OSPFv3 use to secure commun...

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