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- CCNA Routing and Switching 200-105
121.
Which of the following configuration settings does not have a separate IPv4/EIGRP
for IPv4 and IPv6/EIGRP for IPv6 setting, instead using one setting that both EIGRP
for IPv4 and EIGRP for IPv6 use?
- A.Interface bandwidth
- B.Hello timer
- C.Variance
- D.Maximum paths
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The three incorrect answers have separate settings. The Hello timer can be set with the ip hello-timer eigrp asn timer command for EIGRP for IPv4, and with the IP the ipv6 hello-timer eigrp asn timer command for EIGRP for IPv6. The variance and maximum-paths commands, router subcommands, have the same syntax for both routing protocols but are set separately for EIGRP for IPv4 and EIGRP for IPv6. The interface bandwidth and delay commands impact both EIGRP for IPv4 and EIGRP for IPv6. |
122.
An enterprise uses a dual-stack model of deployment for IPv4 and IPv6, using EIGRP
as the routing protocol for both. Router R1 has IPv4 and IPv6 addresses on its G0/0
and S0/0/0 interfaces only, with EIGRP for IPv4 and EIGRP for IPv6 enabled on both
interfaces and the router ID explicitly set for both protocols. Comparing the EIGRP
for IPv4 and EIGRP for IPv6 configuration, which of the following statements is true?
- A.The EIGRP for IPv6 configuration uses the router eigrp asn global command.
- B.Both protocols use the router-id router-id router subcommand.
- C.Both protocols use the network network-number router subcommand.
- D.The EIGRP for IPv6 configuration uses the ipv6 eigrp asn interface subcommand.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The EIGRP for IPv6 configuration would use ipv6 router eigrp asn, eigrp router-id router-id, and then, under each interface, ipv6 eigrp asn. EIGRP for IPv6 does not use the router eigrp asn command (it uses the ipv6 router eigrp asn command instead), and EIGRP for IPv6 also does not use the network command. |
123.
Three redundant IPv6 routes exist on R1 to reach IPv6 subnet 9 (2009:9:9:9::/64), a
subnet connected to Router R9's G0/0 interface. R1's current successor route uses
R2 as the next hop, with feasible successor routes through Routers R3 and R4. Then,
another engineer makes changes to the configuration in the network, resulting in R1
having no routes to reach subnet 9. Which of the answers lists one configuration that
would result in R1 having no routes at all to subnet 9?
- A.Make R9's G0/0 interface passive.
- B.Change R2's EIGRP ASN to some other number, but otherwise keep the same configuration.
- C.Change the Hello timers on all of R1's interfaces from 5 to 4.
- D.Change R1's EIGRP ASN to some other number, but otherwise keep the same configuration.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Before the changes, R1 must have had working neighbor relationships with R2, R3, and R4. Once R1's ASN is changed, R1 cannot be neighbors with those same routers, because the ASNs must be the same number to be neighbors. As for the incorrect answers, changing R2's ASN makes R2's neighborships fail, but R1 should use the redundant routes through R3 and R4. The other two answers cause no failures to routes or neighbors at all. |
124.
R1 and R2 are routers that connect to the same VLAN. Which of the answers list
an item that can prevent the two routers from becoming EIGRP for IPv6 neighbors?
(Choose two answers.)
- A.Mismatched Hello timers
- B.Mismatched ASNs
- C.IPv6 addresses in different subnets
- D.Using the same router ID
- E.One passive router interface (used on this link)
- Answer & Explanation
- Report
Answer : [B, E]
Explanation :
Explanation :
| EIGRP for IPv6 uses the same rules as EIGRP for IPv4 in regard to all these items except the addresses; EIGRP for IPv6 does not require that the neighbors have IPv6 addresses in the same subnet. The two routers must use the same ASN, and neither can have its interface set to passive; otherwise, the neighbor relationship fails to complete. However, the Hello timer can be different, the router IDs can be the same, and the IPv6 addresses can be in different subnets. |
125.
The output of the show ipv6 eigrp neighbors command from R2 lists one neighbor.
Which of the following answers is correct about the meaning of the output of the
command in this example?
R2# show ipv6 eigrp neighbors
EIGRP-IPv6 Neighbors for AS(1)
H Address Interface Hold Uptime SRTT RTO Q Seq
( sec) (ms) Cnt Num
0 Link-local address: Gi0/0 11 06:46:11 1 100 0 30
FE80::FF:FE22.2222
- A.The neighbor's link-local address on its common link must be FE80::FF:FE22:2222.
- B.The neighbor's EIGRP for IPv6 router ID must be FE80::FF:FE22:2222.
- C.R2's link-local address on its common link must be FE80::FF:FE22:2222.
- D.R2's EIGRP for IPv6 router ID must be FE80::FF:FE22:2222.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The output of this command identifies the neighbor router, based on the neighbor's link-local address on the link between the two routers. The two incorrect answers that mention the router ID have to be incorrect because EIGRP for IPv6 router IDs are 32-bit values represented as dotted-decimal numbers, so they look like IPv4 addresses. |
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