300-410 practice questions 541–550

1. Question 541 · 578 in bank

   Refer to the exhibit.

   

   BGP and EIGRP are mutually redistributed on R3, and EIGRP and OSPF are mutually redistributed on R1. Users report packet loss and interruption of service to applications hosted on the 10.1.1.0/24 prefix. An engineer tested the link from R3 to R4 with no packet loss present but has noticed frequent routing changes on R3 when running the debug ip route command. Which action stabilizes the service?

   • AReduce frequent OSPF SPF calculations on R3 that cause a high CPU and packet loss on traffic traversing R3.
   • BTag the 10.1.1.0/24 prefix and deny the prefix from being redistributed into OSPF on R1.
   • CPlace an OSPF distribute-list outbound on R3 to block the 10.1.1.0/24 prefix from being advertised back to R3.
   • DRepeat the test from R4 using ICMP ping on the local 10.1.1.0/24 prefix, and fix any Layer 2 errors on the host or switch side of the subnet.

   Show answer

   Answer: B

   Explanation

   Given answer is correct. B is the only one with makes sence. A = this is not an action C = Outbound to fix advertisments back into R3? Inbound would be good but this doesn't fix the problem D = No L2 issue The Issue is that the AD from IBGP is 200. Highter than the AD from OSPF (110) or external EIGRP (170)

   Source: Adapted from community discussion — ciscomicha

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2. Question 542 · 578 in bank

   Refer to the exhibit. An engineer has configured policy-based routing and applied the configuration to the correct interface. How is the configuration applied to the traffic that matches the access list?

   

   • AIt is forwarded using the routing table lookup.
   • BIt is sent to 209.165.202.129.
   • CIt is dropped.
   • DIt is sent to 209.165.202.131.

   Show answer

   Answer: D

   Explanation

   It's tempting to select C because of the policy routing matches. But the question explicitly states: How is the configuration applied to the traffic that matches the access list? So the traffic matching the ACL will choose the second next-hop. Again, trick questions designed to mess up your mind and make you fail the exam to generate revenue for Cisco.

   Source: Adapted from community discussion — JOKERR

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3. Question 543 · 578 in bank

   Refer to the exhibit.

   

   A network administrator reviews the branch router console log to troubleshoot the OSPF adjacency issue with the DR router. Which action resolves this issue?

   • AStabilize the DR site flapping link to establish OSPF adjacency.
   • BAdvertise the branch WAN interface matching subnet for the DR site.
   • CConfigure the WAN interface for DR site in the related OSPF area.
   • DConfigure matching hello and dead intervals between sites.

   Show answer

   Answer: B

   Explanation

   B is more appropriate because netmask doesn't match between neighbors R1# OSPF: Mismatched hello parameters from 192.168.12.2 OSPF: Dead R 40 C 40, Hello R 10 C 10 Mask R 255.255.255.128 C 255.255.255.0 Now we have something to work with. R1 says it received a hello packet but we have mismatched hello parameters. The R stands for what we received and the C stands for what we have configured. You can see that there is a mismatch in the subnet mask. R1 is configured with subnet mask 255.255.255.0 while R2 has subnet mask 255.255.255.240. OSPF will only compare the subnet mask when you are using the broadcast network type. You can also spot this error if you look at the OSPF information per interface. Broadcast is using a DR router while point-to-point doesn't use a DR router

   Source: Adapted from community discussion — Edwinmolinab

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4. Question 544 · 578 in bank

   Refer to the exhibit.

   

   When the FastEthernet0/1 goes down, the route to 172.29.0.0/16 via 192.168.253.2 is not installed in the RIB. Which action resolves the issue?

   • AConfigure feasible distance greater than the reported distance.
   • BConfigure feasible distance greater than the successor's feasible distance.
   • CConfigure reported distance greater than the successor's feasible distance.
   • DConfigure reported distance greater than the feasible distance.

   Show answer

   Answer: A

   Explanation

   For feasibility condition: RD of feasible successor (352300) < FD of successor (307200) 1) make RD of feasible successor smaller (no such answer) or 2) make FD of successor greater = answer "A"

   Source: Adapted from community discussion — HungarianDish_111

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5. Question 545 · 578 in bank

   Refer to the exhibit.

   

   

   AS111 is receiving its own routes from AS200 causing a loop in the network. Which configuration provides loop prevention?

   • Arouter bgp 111 neighbor 195.1.1.1 as-override no neighbor 195.1.2.2 allowas-in
   • Brouter bgp 111 no neighbor 195.1.1.1 allowas-in no neighbor 195.1.2.2 allowas-in
   • Crouter bgp 111 neighbor 195.1.2.2 as-override no neighbor 195.1.1.1 allowas-in
   • Drouter bgp 111 neighbor 195.1.1.1 as-override neighbor 195.1.2.2 as-override

   Show answer

   Answer: B

   Explanation

   the allowas-in command is used to allow prefixes to be received by the router even if they contain its own AS number in the AS_PATH. the best option is to stop accepting routes containing AS111's own AS number

   Source: Adapted from community discussion — MasoudGhorbani

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6. Question 546 · 578 in bank

   Refer to the exhibit.

   

   AS65510 iBGP is configured for directly connected neighbors. R4 cannot ping or traceroute network 192.168.100.0/24. Which action resolves this issue?

   • AConfigure R1 as a route reflector server and configure R2 and R3 as route reflector clients.
   • BConfigure R4 as a route reflector server and configure R2 and R3 as route reflector clients.
   • CConfigure R4 as a route reflector server and configure R1 as a route reflector client.
   • DConfigure R1 as a route reflector server and configure R4 as a route reflector client.

   Show answer

   Answer: D

   Explanation

   All answers are wrong. R1 and R4 do not see each other's routes because they are two hops apart. They need a route reflector between them, either R2 or R3.

   Source: Adapted from community discussion — timtgh

   References

   • Cisco documentation

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7. Question 547 · 578 in bank

   Users report issues with reachability between areas as soon as an engineer configured summary routes between areas in a multiple area OSPF autonomous system. Which action resolves the issue?

   • AConfigure the area range command on the ASBR.
   • BConfigure the summary-address command on the ASBR.
   • CConfigure the summary-address command on the ABR.
   • DConfigure the area range command on the ABR.

   Show answer

   Answer: D

   Explanation

   D is correct answer The area range command is used only with area border routers (ABRs). It is used to consolidate or summarize routes for an area. The result is that a single summary route is advertised to other areas by the ABR. Routing information is condensed at area boundaries. External to the area, a single route is advertised for each address range.

   Source: Adapted from community discussion — Nhan

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8. Question 548 · 578 in bank

   Refer to the exhibit. An engineer is trying to generate a summary route in OSPF for network 10.0.0.0/8, but the summary route does not show up in the routing table. Why is the summary route missing?

   

   • AThe summary-address command is used only for summarizing prefixes between areas.
   • BThe summary route is visible only in the OSPF database, not in the routing table.
   • CThere is no route for a subnet inside 10.0.0.0/8, so the summary route is not generated.
   • DThe summary route is not visible on this router, but it is visible on other OSPF routers in the same area.

   Show answer

   Answer: C

   Explanation

   the command "summary-address" is used to summary external routes (O E1/2) in ASBR. The command "redistribute static" in the question makes the router a ASBR. To summary inter area routes into ABRs you use "area x range" command. In both cases the summary route is advertised only if the RIB has a route that matches the summary prefix.

   Source: Adapted from community discussion — Malasxd

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9. Question 549 · 578 in bank

   Refer to the exhibit.

   

   Which set of commands restore reachability to loopback0?

   • Ainterface loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf network point-to-point
   • Binterface loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf interface area 10
   • Cinterface loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf network broadcast
   • Dinterface loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf interface type network

   Show answer

   Answer: A

   Explanation

   Loopbacks are considered host routes in Open Shortest Path First (OSPF). To make OSPF advertise the loopback subnet as the actual subnet with the loopback mask, instead of as host route /32, issue the ip ospf network point-to-point command under the loopback interface. For more information, refer to the 9.1. Interface States section of RFC 2328.

   Source: Adapted from community discussion — Carl1999

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10. Question 550 · 578 in bank

    

    AS 111 wanted to use AS 200 as the preferred path for 172.20.5.0/24 and AS 100 as the backup. After the configuration, AS 100 is not used for any other routes.

    

    Which configuration resolves the issue?

    • Aroute-map SETLP permit 10 match ip address prefix-list PLIST1 set local-preference 99 route-map SETLP permit 20
    • Brouter bgp 111 no neighbor 192.168.10.1 route-map SETLP in neighbor 192.168.20.2 route-map SETLP in
    • Croute-map SETLP permit 10 match ip address prefix-list PLIST1 set local-preference 110 route-map SETLP permit 20
    • Drouter bgp 111 no neighbor 192.168.10.1 route-map SETLP in neighbor 192.168.10.1 route-map SETLP out

    Show answer

    Answer: A

    Explanation

    A works because the default local pref is 100. Making the local pref 99 will decrement the quality of the route enough to install the route from AS200 into the RIB. The reason traffic wasnt using AS100 for any other routes is because of the logic of the route map. Seq 10 matches on a specific range of ip's. Therefore traffic that doesnt match that range will move onto the next seq #, but in our case there is none so all other traffic hits the implicit deny at the end of the route map. Adding a seq 20 to match on all traffic (not having a match statement) will allow all other NLRI thru from AS100 to AS111.

    Source: Adapted from community discussion — JingleJangus

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300-410 practice, question 541. 578 questions available.