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Juniper JN0-351 Exam Practice Questions (P. 2)

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Question #6

You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)
  1. A
    Create static routes on the switches using the local vMX router's loopback interface for the next hop.
  2. B
    Configure and apply a routing policy that redistributes the Dallas and Denver subnets using Type 5 LSAs.
  3. C
    Configure and apply a routing policy that redistributes the connected Dallas and Denver subnets.
  4. D
    Enable the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets.

Correct Answer:
CD

Question #7

You want to verify prefix information being sent from 10.36.1.4.
Which two statements are correct about the output shown in the exhibit? (Choose two.)
  1. A
    The routes displayed have traversed one or more autonomous systems.
  2. B
    The output shows routes that were received prior to the application of any BGP import policies.
  3. C
    The output shows routes that are active and rejected by an import policy.
  4. D
    The routes displayed are being learned from an IBGP peer.

Correct Answer:
BD

Question #8
What is the default keepalive time for BGP?
  1. A
    10 seconds
  2. B
    60 seconds
  3. C
    30 seconds
  4. D
    90 seconds

Correct Answer:
B
chatbot-img GPT-4o - Answer
Hey, just to clear things up: although it was indicated that the default BGP keepalive time is 60 seconds, the correct default for Juniper devices is actually 30 seconds. BGP needs to frequently ensure that paths are active, and by default, Juniper routers send a keepalive every 30 seconds. This setting helps maintain stability in the network by verifying the link's status within reasonably quick intervals, without causing excessive overhead.

Question #9
Which two statements are correct about tunnels? (Choose two.)
  1. A
    BFD cannot be used to monitor tunnels.
  2. B
    Tunnel endpoints must have a valid route to the remote tunnel endpoint.
  3. C
    IP-IP tunnels are stateful.
  4. D
    Tunnels add additional overhead to packet size.

Correct Answer:
BD
chatbot-img GPT-4o - Answer
When setting up tunnels, it's crucial to remember that each endpoint needs a solid route to the other. Skipping this can quake trouble in connectivity. Also, don't forget about the extra overhead. Tunnels wrap up the original packet in a new header, which makes the whole packet bulkier. Keep these points in mind to avoid common pitfalls and ensure a smooth setup.

Question #10
Which statement is correct about IP-IP tunnels?
  1. A
    IP-IP tunnels only support encapsulating IP traffic.
  2. B
    IP-IP tunnels only support encapsulating non-IP traffic.
  3. C
    The TTL in the inner packet is decremented during transit to the tunnel endpoint.
  4. D
    There are 24 bytes of overhead with IP-IP encapsulation.

Correct Answer:
A
chatbot-img GPT-4o - Answer
IP-IP tunnels specifically facilitate the encapsulation of IP packets within another IP packets. This unique purpose restricts their use solely to IP traffic, contrasting with other tunneling protocols that may support different forms of data transport. Importantly, the role of IP-IP tunnels in maintaining tunnel integrity ensures that the inner IP headers remain undisturbed throughout their transit across the intermediate networks, except for the decrement of TTL by the encapsulating router. Essentially, this selective functionality underpins their usage in network setups requiring direct IP over IP encapsulation.

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