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Free JN0-664 Exam Braindumps (page: 7)

Page 7 of 17
PDF with 96 Questions

Which two statements about IS-IS are correct? (Choose two.)

  1. PSNPs are flooded periodically.
  2. PSNPs contain only descriptions of LSPs.
  3. CSNPs are flooded periodically
  4. CSNPs contain only descriptions of LSPs.

Answer(s): B,C

Explanation:

IS-IS is an interior gateway protocol that uses link-state routing to exchange routing information among routers within a single autonomous system. IS-IS uses two types of packets to synchronize link-state databases among routers: Link State Packets (LSPs) and Partial Sequence Number Packets (PSNPs). LSPs contain information about the state and cost of links in the network, and are flooded periodically throughout the network. PSNPs are used to acknowledge receipt of LSPs and request retransmission of missing or corrupted LSPs. PSNPs contain only descriptions of LSPs, such as their sequence numbers and checksums3. IS-IS also uses another type of packet called Complete Sequence Number Packets (CSNPs), which are used to summarize the entire link-state database at regular intervals or when a new adjacency is formed. CSNPs are flooded periodically throughout the network and contain only descriptions of LSPs4. Therefore, PSNPs contain only descriptions of LSPs and CSNPs are flooded periodically.


Reference:

https://www.juniper.net/documentation/us/en/software/junos/routing- policy/topics/concept/routing-policy-is-is-partial-sequence-number-packet-psnp.html https://www.juniper.net/documentation/us/en/software/junos/routing- policy/topics/concept/routing-policy-is-is-complete-sequence-number-packet-csnp.html



Which two statements are correct about VPLS tunnels? (Choose two.)

  1. LDP-signaled VPLS tunnels only support control bit 0.
  2. LDP-signaled VPLS tunnels use auto-discovery to provision sites
  3. BGP-signaled VPLS tunnels can use either RSVP or LDP between the PE routers.
  4. BGP-signaled VPLS tunnels require manual provisioning of sites.

Answer(s): B,C

Explanation:

VPLS is a Layer 2 VPN technology that allows multiple sites to connect over a shared IP/MPLS network as if they were on the same LAN. VPLS tunnels can be signaled using either Label Distribution Protocol (LDP) or Border Gateway Protocol (BGP). LDP-signaled VPLS tunnels use auto- discovery to provision sites, meaning that PE routers can automatically discover other PE routers that belong to the same VPLS instance



Exhibit



CE-1 must advertise ten subnets to PE-1 using BGP Once CE-1 starts advertising the subnets to PE-1, the BGP peering state changes to Active.
Referring to the CLI output shown in the exhibit, which statement is correct?

  1. CE-1 is advertising its entire routing table.
  2. CE-1 is configured with an incorrect peer AS
  3. The prefix limit has been reached on PE-1
  4. CE-1 is unreachable

Answer(s): B

Explanation:

The problem in this scenario is that CE-1 is configured with an incorrect peer AS number for its BGP session with PE-1. The CLI output shows that CE-1 is using AS 65531 as its local AS number and AS 65530 as its peer AS number. However, PE-1 is using AS 65530 as its local AS number and AS 65531 as its peer AS number. This causes a mismatch in the BGP OPEN messages and prevents the BGP session from being established. To solve this problem, CE-1 should configure its peer AS number as 65530 under [edit protocols bgp group external] hierarchy level.



After a recent power outage, your manager asks you to investigate ways to automatically reduce the impact caused by suboptimal routing in your OSPF and OSPFv3 network after devices reboot. Which three configuration statements accomplish this task? (Choose three.)

  1. set protocols ospf overload timeout 900
  2. set protocols ospf3 realm ipv4-unicast overload timeout 900
  3. set protocols ospf overload
  4. set protocols oapf3 overload timeout 900
  5. set protocols ospf3 overload

Answer(s): A,E

Explanation:

To reduce the impact of suboptimal routing in OSPF and OSPFv3 after devices reboot, you can use the overload feature to prevent a router from being used as a transit router for a specified period of time. This allows the router to stabilize its routing table before forwarding traffic for other routers. To enable the overload feature, you need to do the following:
For OSPF, configure the overload statement under [edit protocols ospf] hierarchy level. You can also specify a timeout value in seconds to indicate how long the router should remain in overload state after it boots up. For example, set protocols ospf overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up.
For OSPFv3, configure the overload statement under [edit protocols ospf3] hierarchy level. You can also specify a realm (ipv4-unicast or ipv6-unicast) and a timeout value in seconds to indicate how long the router should remain in overload state after it boots up for each realm. For example, set protocols ospf3 realm ipv4-unicast overload timeout 900 means that the router will be in overload state for 15 minutes after it boots up for IPv4 unicast routing.



Page 7 of 17



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chris commented on October 16, 2024
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