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Exam 350-401 topic 1 question 363 discussion

Actual exam question from Cisco's 350-401
Question #: 363
Topic #: 1
[All 350-401 Questions]

A network engineer is configuring OSPF on a router. The engineer wants to prevent having a route to 172.16.0.0/16 learned via OSPF in the routing table and configures a prefix list using the command ip prefix-list OFFICE seq 5 deny 172.16.0.0/16. Which two additional configuration commands must be applied to accomplish the goal? (Choose two.)

  • A. ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 le 32
  • B. distribute-list prefix OFFICE in under the OSPF process
  • C. distribute-list OFFICE in under the OSPF process
  • D. distribute-list OFFICE out under the OSPF process
  • E. ip prefix-list OFFICE seq 10 permit 0.0.0.0/0 ge 32
Show Suggested Answer Hide Answer
Suggested Answer: AB 🗳️
by greencafe24 at Sept. 14, 2022, 11:58 a.m.

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[Removed]
Highly Voted 2 years ago
Selected Answer: AB
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
upvoted 8 times
HarwinderSekhon
1 year, 11 months ago
Yes. ACL vs Prefix.
upvoted 1 times
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TSKARAN
Highly Voted 2 years, 5 months ago
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
upvoted 6 times
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andrpercud
Most Recent 7 months, 4 weeks ago
Selected Answer: AB
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.
upvoted 2 times
Marlboro2001
1 month ago
distribute-list prefix OFFICE in .....prevents the route from entering the local routing table (into RIB).
upvoted 1 times
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[Removed]
1 year ago
Selected Answer: AB
A and B are correct
upvoted 1 times
[Removed]
1 year ago
ip prefix-list OFFICE: This specifies the name of the prefix list. seq 10: This indicates the sequence number of the entry within the prefix list. It determines the order in which entries are evaluated. permit: This keyword specifies that the action for the matched prefixes will be to permit them. 0.0.0.0/0: This is the IP address prefix being matched. 0.0.0.0/0 represents all possible IP addresses. le 32: This is a length option. le stands for less than or equal to, and 32 specifies the maximum prefix length that will be permitted. Since it's set to 32, it allows all prefixes with a length up to /32, which includes individual host addresses.
upvoted 2 times
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djedeen
1 year, 10 months ago
Selected Answer: AB
permit 0.0.0.0/0 le 32 -> all networks (subnet mask of /32 or smaller, e.g. everything).
upvoted 2 times
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nikramor
2 years ago
Selected Answer: AB
Given answer is correct
upvoted 1 times
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bendarkel
2 years, 3 months ago
Selected Answer: AB
Correct answers: A and B
upvoted 2 times
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kewokil120
2 years, 5 months ago
Selected Answer: AB
I like ab
upvoted 3 times
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nushadu
2 years, 6 months ago
Selected Answer: 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)#
upvoted 1 times
nushadu
2 years, 6 months ago
sw1(config-router)#distribute-list prefix PL_1 in 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, 00:00:03, Vlan10 sw1(config-router)# ### rollback sw1(config-router)# sw1(config-router)#no distribute-list prefix PL_1 in 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, 00:00:02, Vlan10 172.16.0.0/24 is subnetted, 2 subnets O 172.16.13.0 [110/11] via 192.168.255.3, 00:00:02, Vlan10 O 172.16.113.0 [110/11] via 192.168.255.3, 00:00:02, Vlan10 sw1(config-router)#
upvoted 1 times
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Xerath
2 years, 6 months ago
Selected Answer: AB
A & B are 100% correct.
upvoted 1 times
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jucevabe
2 years, 9 months ago
AyB tested in GNS3
upvoted 2 times
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jucevabe
2 years, 9 months ago
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
upvoted 1 times
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greencafe24
2 years, 9 months ago
Selected Answer: AC
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
upvoted 2 times
greencafe24
2 years, 9 months ago
Forget what I said, I don't know how to remove my comment. AB is correct.
upvoted 6 times
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C (25%)
B (20%)
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