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Case Study: 1
A network administrator is troubleshooting an EIGRP connection between RouterA, IP address 10.1.2.1, and RouterB, IP address 10.1.2.2. Given the debug output on RouterA, which two statements are true? (Choose two.)
A. RouterA received a hello packet with mismatched autonomous system numbers.
B. RouterA received a hello packet with mismatched hello timers.
C. RouterA received a hello packet with mismatched authentication parameters.
D. RouterA received a hello packet with mismatched metric-calculation mechanisms.
E. RouterA will form an adjacency with RouterB.
F. RouterA will not form an adjacency with RouterB.
Answer: D, F
When troubleshooting an EIGRP connectivity problem, you notice that two connected EIGRP routers are not becoming EIGRP neighbors. A ping between the two routers was successful. What is the next thing that should be checked?
A. Verify that the EIGRP hello and hold timers match exactly.
B. Verify that EIGRP broadcast packets are not being dropped between the two routers with the show ip EIGRP peer command.
C. Verify that EIGRP broadcast packets are not being dropped between the two routers with the show ip EIGRP traffic command.
D. Verify that EIGRP is enabled for the appropriate networks on the local and neighboring router.
Refer to the exhibit.
How would you confirm on R1 that load balancing is actually occurring on the default-network (0.0.0.0)?
A. Use ping and the show ip route command to confirm the timers for each default network resets to 0.
B. Load balancing does not occur over default networks; the second route will only be used for failover.
C. Use an extended ping along with repeated show ip route commands to confirm the gateway of last resort address toggles back and forth.
D. Use the traceroute command to an address that is not explicitly in the routing table.
Which IPsec mode will encrypt a GRE tunnel to provide multiprotocol support and reduced overhead?
B. multipoint GRE
Which three features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs? (Choose three.)
A. allows dynamic routing over the tunnel
B. supports multi-protocol (non-IP) traffic over the tunnel
C. reduces IPsec headers overhead since tunnel mode is used
D. simplifies the ACL used in the crypto map
E. uses Virtual Tunnel Interface (VTI) to simplify the IPsec VPN configuration
Answer: A, B, D
Which statement is true about an IPsec/GRE tunnel?
A. The GRE tunnel source and destination addresses are specified within the IPsec transform set.
B. An IPsec/GRE tunnel must use IPsec tunnel mode.
C. GRE encapsulation occurs before the IPsec encryption process.
D. Crypto map ACL is not needed to match which traffic will be protected.
You are troubleshooting an issue with a GRE tunnel between R1 and R2 and find that routing is OK on all intermediary routers. The tunnel is up on R1, but down on R2. Which two possible issues can prevent the tunnel from coming up? (Choose Two)
A. The tunnel does not come up unless traffic is sent through it.
B. The tunnel source interface is down on R2.
C. No specific route interface is down on R2.
D. R2 does not know how to reach the tunnel destination.
E. The tunnel keep alive timer doesn’t match on R1 and R2.
Four Different Tunnel States
There are four possible states in which a GRE tunnel interface can be:
1. Up/up – This implies that the tunnel is fully functional and passes traffic. It is both adminstratively up and it’s protocol is up as well.
2. Adminstratively down/down – This implies that the interface has been administratively shut down.
3. Up/down – This implies that, even though the tunnel is administratively up, something causes the line protocol on the interface to be down.
4. Reset/down – This is usually a transient state when the tunnel is reset by software. This usually happens when the tunnel is misconfigured with a Next Hop Server (NHS) that is it’s own IP address.
When a tunnel interface is first created and no other configuration is applied to it, the interface is not shut by default:
Refer to the Exhibit:
Which output is expected in the blank line for the OSPF adjacency process?
You can check the output of “debug ip ospf adj” here: