Exam 350-401 topic 1 question 363 discussion

when referencing a prefix-list, you need to specify that its a prefix you are referencing, without the keyword prefix, you'll be referencing an ACL

CORRECT Answer: AB vIOS-R1(config)#router ospf 10 vIOS-R1(config-router)#dis? discard-route distance distribute-list vIOS-R1(config-router)#distr vIOS-R1(config-router)#distribute-list ? <1-199> IP access list number <1300-2699> IP expanded access list number WORD Access-list name gateway Filtering incoming updates based on gateway prefix Filter prefixes in routing updates route-map Filter prefixes based on the route-map vIOS-R1(config-router)#distribute-list pre vIOS-R1(config-router)#distribute-list prefix ? WORD Name of an IP prefix-list vIOS-R1(config-router)#distribute-list prefix OFFICE ? gateway Filtering incoming updates based on gateway in Filter incoming routing updates out Filter outgoing routing updates vIOS-R1(config-router)#distribute-list prefix OFFICE

To prevent the route to 172.16.0.0/16 from being learned via OSPF, the engineer needs to configure a prefix list and apply it properly in the OSPF process. The correct additional configuration commands are: Correct Options: B. distribute-list prefix OFFICE in under the OSPF process Explanation: This command applies the prefix list to incoming OSPF updates, filtering out the denied route (172.16.0.0/16) from being accepted into the OSPF routing table. A. ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 le 32 Explanation: This command allows all other routes by permitting any prefix length up to 32 bits, ensuring that the prefix list is valid and does not block all traffic.

A and B are correct

permit 0.0.0.0/0 le 32 -> all networks (subnet mask of /32 or smaller, e.g. everything).

Given answer is correct

Correct answers: A and B

I like ab

pay attention to 172.16.13.0/24 & 172.16.113.0/24 netw (they'll disappear in the end) sw1(config-router)#do s run | s router ospf 1 router ospf 1 passive-interface default no passive-interface Vlan10 network 0.0.0.0 255.255.255.255 area 0 sw1(config-router)# sw1(config-router)#do s ip rou ospf | b Gate Gateway of last resort is 192.168.255.1 to network 0.0.0.0 3.0.0.0/32 is subnetted, 1 subnets O 3.3.3.3 [110/2] via 192.168.255.3, 00:00:17, Vlan10 172.16.0.0/24 is subnetted, 2 subnets O 172.16.13.0 [110/11] via 192.168.255.3, 00:00:17, Vlan10 <<<<<<<<<<<<<< remove it O 172.16.113.0 [110/11] via 192.168.255.3, 00:00:17, Vlan10 <<<<<<<<<<<<<<< remove it sw1(config-router)# sw1(config-router)#do s runn | s pref ip prefix-list PL_1 seq 10 deny 172.16.13.0/24 ip prefix-list PL_1 seq 11 deny 172.16.113.0/24 ip prefix-list PL_1 seq 20 permit 0.0.0.0/0 le 32 sw1(config-router)#

A & B are 100% correct.

AyB tested in GNS3

R1(config-router)#distri R1(config-router)#distribute-list ? <1-199> IP access list number <1300-2699> IP expanded access list number WORD Access-list name gateway Filtering incoming updates based on gateway prefix Filter prefixes in routing updates route-map Filter prefixes based on the route-map R1(config-router)#distribute-list pref R1(config-router)#distribute-list prefix OFFICE % Incomplete command. R1(config-router)#distribute-list prefix OFFICE ? gateway Filtering incoming updates based on gateway in Filter incoming routing updates out Filter outgoing routing updates R1(config-router)#distribute-list prefix OFFICE in R1(config-router)# R1# *Sep 15 15:23:26.891: %SYS-5-CONFIG_I: Configured from console by console R1# EN GNS3 router 7200

Wrong answer. AC is correct. Command B doesn't exist. Router(config)#router ospf 1 Router(config-router)#distribute-list test ? in Filter incoming routing updates out Filter outgoing routing updates