Implementing Cisco IP Routing
Question No: 71 – (Topic 5)
Refer to the following access list. access-list 100 permit ip any any log
After applying the access list on a Cisco router, the network engineer notices that the router CPU utilization has risen to 99 percent. What is the reason for this?
A packet that matches access-list with the quot;logquot; keyword is Cisco Express Forwarding switched.
A packet that matches access-list with the quot;logquot; keyword is fast switched.
A packet that matches access-list with the quot;logquot; keyword is process switched.
A large amount of IP traffic is being permitted on the router.
Question No: 72 – (Topic 5)
Refer to the exhibit.
If R1 is configured for 6to4 tunneling, what will the prefix of its IPv6 network be?
Question No: 73 – (Topic 5)
Refer to the exhibit. Will redistributed RIP routes from OSPF Area 2 be allowed in Area 1?
Because Area 1 is an NSSA, redistributed RIP routes will not be allowed.
Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 5 LSAs in Area 0 and passed on into Area 1.
Because NSSA will discard type 7 LSAs, redistributed RIP routes will not be allowed in Area 1.
Redistributed RIP routes will be allowed in Area 1 because they will be changed into type 7 LSAs in Area 0 and passed on into Area 1.
RIP routes will be allowed in Area 1 only if they are first redistributed into EIGRP.
Answer: A Explanation:
The following are several area types that are possible on OSPF:
Question No: 74 – (Topic 5)
Which three steps are most helpful in verifying proper route redistribution? (Choose three.)
On the routers not performing the route redistribution, use the show ip route command to see if the redistributed routes show up.
On the ASBR router performing the route redistribution, use the show ip protocol command to verify the redistribution configurations.
On the ASBR router performing the route redistribution, use the show ip route command to verify that the proper routes from each routing protocol are there.
On the routers not performing the route redistribution, use the show ip protocols command to verify the routing information sources.
On the routers not performing the route redistribution, use the debug ip routing command to verify the routing updates from the ASBR.
Answer: A,B,C Explanation:
In order to verify proper route redistribution, use the 鈥渟how ip route鈥?command on all routers within the network, as well as the ABSR, to verify that the routes are properly being advertised to all routers. In addition, issuing the 鈥渟how ip protocol鈥?can be used on the router performing the redistribution to verify that routes are being redistributed into each other.
Question No: 75 – (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: 76 – (Topic 5)
Into which two types of areas would an area border router (ABR) inject a default route? (Choose two.)
the autonomous system of an exterior gateway protocol (EGP)
the autonomous system of a different interior gateway protocol (IGP)
Answer: A,D Explanation: Explanation
Both stub area amp; totally stubby area allow an ABR to inject a default route. The main difference between these 2 types of areas is:
Stub area replaces LSA Type 5 (External LSA – created by an ASBR to advertise network from another autonomous system) with a default route Totally stubby area replaces both LSA Type 5 and LSA Type 3 (Summary LSA – created by an ABR to advertise network from other areas, but still within the AS, sometimes called interarea routes) with a default route.
Below summarizes the LSA Types allowed and not allowed in area types:
Question No: 77 – (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: 78 – (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
The command 鈥渄istribute-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: 79 – (Topic 5)
Refer to the exhibit.
R1 and R2 belong to the RIP routing domain that includes the networks 10.20.0.0/16 and 10.21.0.0/16. R3 and R4 are performing two-way route redistribution between OSPF and RIP. A network administrator has discovered that R2 is receiving OSPF routes for the networks 10.20.0.0/16 and 10.21.0.0/16 and a routing loop has occurred.
Which action will correct this problem?
Apply an inbound ACL to the R2 serial interface.
Change the RIP administrative distance on R3 to 110.
Configure distribute-lists on R3 and R4.
Set the OSPF default metric to 20.
Change the OSPF administrative distance on R3 to 110.
Distribute List is Like an access-list, use to deny or permit the routing update to pass through a router/interface. Distribute List allow you apply an access list to a routing updates.
It can be apply on in or out bond of an interface under a routing process. e.g in fig. R1 want to send a routing update to it neighbor, this update will go through from interface S0/0, router will check, is there some Distribute List apply to this interface. If there is a Distribute List which would contain the allow route to pass through this interface.
Question No: 80 – (Topic 5)
R3#show run | include defaultip default-network 188.8.131.52
ip default-network 184.108.40.206 R3#show ip route | begin Gateway
Gateway of last resort is 0.0.0.0 to network 220.127.116.11 18.104.22.168/8 is variably subnetted, 5 subnets, 3 masks C 22.214.171.124/30 is directly connected, Serial1/0.2
C 126.96.36.199/30 is directly connected, Serial2/0.2 C 188.8.131.52/28 is directly connected, Serial1/0.1 C 184.108.40.206/28 is directly connected, Serial2/0.1 S 220.127.116.11/8 [1/0] via 18.104.22.168
22.214.171.124/32 is subnetted, 3 subnets
O 126.96.36.199 [110/65] via 188.8.131.52, 00:14:54, Serial1/0.1
O 184.108.40.206 [110/65] via 220.127.116.11, 00:14:54, Serial1/0.1
O 18.104.22.168 [110/65] via 22.214.171.124, 00:14:54, Serial1/0.1
126.96.36.199/16 is variably subnetted, 4 subnets, 2 masks D* 188.8.131.52/16 is a summary, 00:30:04, Null0
C 184.108.40.206/24 is directly connected, Ethernet0/0 C 220.127.116.11/24 is directly connected, Ethernet0/1 C 18.104.22.168/24 is directly connected, Ethernet1/0
D 22.214.171.124/16 [90/679936] via 126.96.36.199, 00:02:58, Serial2/0.1
Refer to the exhibit. Why is the 188.8.131.52 network not used as the gateway of last resort even though it is configured first?
The last default-network statement will always be preferred.
A route to the 184.108.40.206 network does not exist in the routing table.
Default-network selection will always prefer the statement with the lowest IP address.
A router will load balance across multiple default-networks; repeatedly issuing the show ip route command would show the gateway of last resort changing between the two networks.
Answer: B Explanation:
As you can see in the exhibit, 220.127.116.11 doesn’t appear in the routing table.
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