Implementing Cisco IP Routing
Question No: 71 – (Topic 5)
Refer to the following command: router(config)# ip http secure-port 4433 Which statement is true?
The router will listen on port 4433 for HTTPS traffic.
The router will listen on port 4433 for HTTP traffic.
The router will never accept any HTTP and HTTPS traffic.
The router will listen to HTTP and HTTP traffic on port 4433.
Question No: 72 – (Topic 5)
Study this exhibit below carefully.
What is the effect of the distribute-list command in the R1 configuration?
R1 will permit only the 10.0.0.0/24 route in the R2 RIP updates
R1 will not filter any routes because there is no exact prefix match
R1 will filter the 10.1.0.0/24 and the 172.24.1.0/24 routes from the R2 RIP updates
R1 will filter only the 172.24.1.0/24 route from the R2 RIP updates
Answer: C Explanation:
The command “distribute-list 10 in Serial0 will create an incoming distribute list for interface serial 0 and refers to access list 10. So it will permit routing updates from 10.0.x.x network while other entries (in this case the 10.1.0.0/24 and 172.24.1.0/24 networks) will be filtered out from the routing update received on interface S0.
Question No: 73 – (Topic 5)
Refer to the exhibit.
Routers R2, R3, R4, and R5 have OSPF enabled. What should be configured on the routers in area 1 to ensure that all default summary routes and redistributed EIGRP routes will be forwarded from R6 to area 1, and only a default route for all other OSPF routes will be forwarded from R5 to area 1.
R5(config-router)# area 1 stubR6(config-router)# area 1 stub
R5(config-router)# area 1 stub no-summaryR6(config-router)# area 1 stub
R5(config-router)# area 1 nssaR6(config-router)# area 1 nssa
R5(config-router)# area 1 nssa no-summaryR6(config-router)# area 1 nssa
Answer: D Explanation:
External RIP routes are being routed in OSPF area 1 where they are injected as type 7 so we use (area 1 NSSA) command on the ASBR(R2) and
(Area 1 NSSA no-summary) command on R3 and R4.
You can verify issuing the command “show ip ospf database” and you will see the type 7 lsa’s on ASBR(R2) and LSA’s Type 5 and 7 on both the ABR routers(R3 ,R4)
Question No: 74 – (Topic 5)
Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table?
Question No: 75 – (Topic 5)
Which routing protocol will continue to receive and process routing updates from neighbors after the passive interface router configuration command is entered?
Question No: 76 – (Topic 5)
A network engineer is configuring a routed interface to forward broadcasts of UDP 69, 53, and 49 to 172.20.14.225. Which command should be applied to the configuration to allow this?
router(config-if)#ip helper-address 172.20.14.225
router(config-if)#udp helper-address 172.20.14.225
router(config-if)#ip udp helper-address 172.20.14.225
router(config-if)#ip helper-address 172.20.14.225 69 53 49
Question No: 77 – (Topic 5)
A network administrator recently redistributed RIP routes into an OSPF domain. However, the administrator wants to configure the network so that instead of 32 external type-5 LSAs flooding into the OSPF network, there is only one.
What must the administrator do to accomplish this?
Configure summarization on R1 with area 1 range 172.16.32.0 255.255.224.0
Configure summarization on R1 with summary-address 172.16.32.0 255.255.224.0
Configure area 1 as a stub area with area 1 stub
Configure area 1 as a NSSA area with area 1 stub nssa
Answer: B Explanation:
In many cases, the router doesn#39;t even need specific routes to each and every subnet (for example, 172.16.1.0/24). It would be just as happy if it knew how to get to the major
network (for example, 172.16.0.0/16) and let another router take it from there. In our telephone network example, the local telephone switch should only need to know to route a phone call to the switch for the called area code. Similarly, a router#39;s ability to take a group of subnetworks and summarize them as one network (in other words, one advertisement) is called route summarization. Besides reducing the number of routing entries that a router must keep track of, route summarization can also help protect an external router from making multiple changes to its routing table due to instability within a particular subnet. For example, let#39;s say that we were working on a router that connected to 172.16.2.0/24. As we were working on the router, we rebooted it several times. If we were not summarizing our routes, an external router would see each time 172.16.2.0/24 went away and came back.
Each time, it would have to modify its own routing table. However, if our external router were receiving only a summary route (i.e., 172.16.0.0/16), then it wouldn#39;t have to be concerned with our work on one particular subnet. This is especially a problem for EIGRP, which can create stuck in active (SIA) routes that can lead to a network melt-down.
Summarization Example We have the following networks that we want to advertise as a single summary route: * 172.16.100.0/24 * 172.16.101.0/24 * 172.16.102.0/24 * 172.16.103.0/24 * 172.16.104.0/24 * 172.16.105.0/24 * 172.16.106.0/24
Question No: 78 – (Topic 5)
Refer to the exhibit.
If R1 is configured for 6to4 tunneling, what will the prefix of its IPv6 network be?
Question No: 79 – (Topic 5)
Which command should be added to RTB under router bgp 100 to allow only the external OSPF routes to be redistributed to RTC?
redistribute ospf 1
redistribute ospf 1 match external 1
redistribute ospf 1 match external 2
redistribute ospf 1 match external 1 external 2
Answer: D Explanation:
Use the external keyword along with the redistribute command under router bgp to redistribute OSPF external routes into BGP. With the external keyword, you have three choices: 1. redistribute both external type-1 and type-2 (Default) 2. redistribute type-1 3. redistribute type-2 Enter the commands in the configuration mode as described here: RTB(config-router)# router bgp 100 RTB(config-router)# redistribute ospf 1 match external.
Question No: 80 – (Topic 5)
A network administrator is troubleshooting a redistribution of OSPF routes into EIGRP.
router eigrp 1
router ospf 1
network 188.8.131.52 0.0.255.255 area 0
redistribute eigrp 1
Given the exhibited commands, which statement is true?
Redistributed routes will have an external type of 1 and a metric of 1.
Redistributed routes will have an external type of 2 and a metric of 20.
Redistributed routes will maintain their original OSPF routing metric.
Redistributed routes will have a default metric of 0 and will be treated as reachable and advertised.
Redistributed routes will have a default metric of 0 but will be treated as unreachable and not advertised.
Answer: B Explanation:
By default, all routes redistributed into OSPF will be tagged as external type 2 (E2) with a metric of 20, except for BGP routes (with a metric of 1).
Note: The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route.
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