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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) Questions 233–240 (page: 31)

Updated On: 9-Jul-2026

A customer requested a GRE tunnel through the provider network between two customer sites using loopback to hide internal networks. Which configuration on R2 establishes the tunnel with R1?

  1. R2(config)#interface Tunnel1 R2(config-if)#ip address 172.20.1.2 255.255.255.0 R2(config-if)#ip mtu 1400 R2(config-if)#ip tcp adjust-mss 1360 R2(config-if)#tunnel source 192.168.20.1 R2(config-if)#tunnel destination 192.168.10.1
  2. R2(config)#interface Tunnel1 R2(config-if#ip address 172.20.1.2 255.255.255.0 R2(config-if)#ip mtu 1400 R2(config-if)#ip tcp adjust-mss 1360 R2(config-if)#tunnel source 10.10.2.2 R2(config-if)#tunnel destination 10.10.1.1
  3. R2(config)#interface Tunnel1 R2(config-if)#ip address 172.20.1.2 255.255.255.0 R2(config-if)#ip mtu 1500 R2(config-if)#ip tcp adjust-mss 1360 R2(config-if)#tunnel source 10.10.2.2 R2(config-if)#tunnel destination 10.10.1.1
  4. R2(config)#interface Tunnel1 R2(config-if)#ip address 172.20.1.2 255.255.255.0 R2(config-if)#ip mtu 1500 R2(config-if)#ip tcp adjust-mss 1360 R2(config-if)#tunnel source 192.168.20.1 R2(config-if)#tunnel destination 10.10.1.1

Answer(s): A



Refer to the exhibit. R1 and R2 are configured for EIGRP peering using authentication and the neighbors failed to come up. Which action resolves the issue?

  1. Configure a matching lowest key-id on both routers.
  2. Configure a matching authentication type on both routers.
  3. Configure a matching key-id number on both routers.
  4. Configure a matching key-chain name on both routers.

Answer(s): A



Refer to the exhibit. Mutual redistribution is enabled between RIP and EIGRP on R2 and R5. Which configuration resolves the routing loop for the 192.168.1.0/24 network?

  1. R2:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s1
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
    R5:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s0
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
  2. R2:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s0
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
    R5:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s0
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
  3. R2:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s0
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
    R5:
    router eigrp 10
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s1
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 10 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
  4. R2:
    router eigrp 7
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s1
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 7 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any
    R5:
    router eigrp 7
    network 181.16.0.0
    redistribute rip metric 1 1 1 1 1
    distribute-list 1 in s1
    !
    router rip
    network 178.1.0.0
    redistribute eigrp 7 metric 2
    !
    access-list 1 deny 192.168.1.0
    access-list 1 permit any

Answer(s): D

Explanation:

Both R2 and R5 are redistributing the rip route for 192.168.1.0/24. What you want to do is block that route that is being received from R3/R4 and being redistributed back into R2 and R5.
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Reference:

https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/8606-redist.html



Which method provides failure detection in BFD?

  1. long duration, low overhead
  2. short duration, low overhead
  3. long duration, high overhead
  4. short duration, high overhead

Answer(s): B



Refer to the exhibit. R4 is experiencing packet drop when trying to reach 172.16.2.7 behind R2. Which action resolves the issue?

  1. Insert a /24 floating static route on R2 toward R3 with metric 254.
  2. Disable auto summarization on R2.
  3. Enable auto summarization on all three routers R1, R2, and R3.
  4. Insert a /16 floating static route on R2 toward R3 with metric 254.

Answer(s): A



Refer to the exhibit. An engineer must advertise routes into IPv6 MP-BGP and failed. Which configuration resolves the issue on R1?

  1. router bgp 64900 no bgp default ipv4-unicast address-family ipv6 unicast redistribute ospf network 2001:DB9::/64
  2. router bgp 64900 no bgp default ipv4-unicast address-family ipv6 multicast neighbor 2001:DB8:7000::2 translate-update ipv6 multicast
  3. router bgp 65000 no bgp default ipv4-unicast address-family ipv6 unicast network 2001:DB8::/64
  4. router bgp 65000 no bgp default ipv4-unicast address-family ipv6 multicast network 2001:DB8::/64

Answer(s): C



Refer to the exhibit. The administrator is trying to overwrite an existing file on the TFTP server that was previously uploaded by another router. However, the attempt to update the file fails.
Which action resolves this issue?

  1. Make the TFTP folder writable by all on the TFTP server.
  2. Make the package.conf file writable by all on the TFTP server.
  3. Make the package.conf file executable by all on the TFTP server.
  4. Make sure to run the TFTP service on the TFTP server.

Answer(s): B



Refer to the exhibit.




A network engineer applied a filter for ISA traffic on OSPFv3 inter area routes on the area 5 ABR to protect advertising the internal routes of area 5 to the business partner network. All other areas should receive the area 5 internal routes. After the respective route filtering configuration is applied on the ABR, area 5 routes are not visible on any of the areas. How must the filter list be applied on the ABR to resolve this issue?

  1. in the "in" direction for area 5 on router R1
  2. in the "in" direction for area 20 on router R2
  3. in the "out" direction for area 20 on router R2
  4. in the "out" direction for area 5 on router R1

Answer(s): D



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