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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q67-Q72):

NEW QUESTION # 67
Which two statements about IS-IS are correct? (Choose two.)

A. CSNPs are flooded periodically
B. PSNPs are flooded periodically.
C. CSNPs contain only descriptions of LSPs.
D. PSNPs contain only descriptions of LSPs.

Answer: A,D

Explanation:
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.
References: 3:
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/routing-policy-is-is-p
4:
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/routing-policy-is-is-c

NEW QUESTION # 68
Exhibit

Which two statements about the output shown in the exhibit are correct? (Choose two.)

A. The PE router has the capability to pop flow labels
B. The PE is attached to a single local site.
C. There has been a VLAN ID mismatch.
D. The connection has not flapped since it was initiated.

Answer: B,D

Explanation:
The output is from the show l2vpn connections command on a Juniper router. This command is used to verify the status of Layer 2 VPN (L2VPN) pseudowires between Provider Edge (PE) routers.
Breakdown of Key Information:
* Instance: vpn-A
* This is the L2VPN instance being monitored.
* Connection Status (St)
* The connection status is "Up", meaning the pseudowire is operational.
* Local Site: CE1-2 (2)
* The PE router is attached to a single local site (CE1-2).
* Uptime & Connection Flaps
* The output shows the last time the connection was up:
Time last up: Apr 11 14:35:27 2020
* The "# Up trans" value is 1, meaning this connection has been established once and has not flapped since it was initiated.
* VLAN ID Mismatch Check
* The legend includes "VM - VLAN ID mismatch", but this status is not present in the connection output.
* This means there is NO VLAN ID mismatch.
* Flow Labels
* The Flow Label Transmit is No, and the Flow Label Receive is No.
* This means the PE router does NOT have the capability to pop flow labels.

NEW QUESTION # 69
Exhibit

You are asked to exchange routes between R1 and R4 as shown in the exhibit. These two routers use the same AS number Which two steps will accomplish this task? (Choose two.)

A. Configure the BGP group with the advertise-peer-as parameter on R1 and R4.
B. Configure the BGP group with the as-override parameter on R1 and R4
C. Configure the BGP group with the as-override parameter on R2 and R3
D. Configure the BGP group with the advertise-peer-as parameter on R2 and R3.

Answer: C,D

Explanation:
https://www.juniper.net/documentation/us/en/software/junos/routing-policy/bgp/topics/example/bgp-advertise- peer-as.html

NEW QUESTION # 70
Exhibit

Referring to the exhibit, which two statements are correct about the dual route reflectors within a cluster? (Choose two.)

A. RR1 and RR2 append the duster ID when advertising routes from dient to dient.
B. RR1 and RR2 must have the same duster ID to exchange routes learned from the client.
C. RR1 and RR2 advertise routes learned from the clients to EBGP peers, using itself as the next hop.
D. RR1 advertises routes from the client to RR2. using itself as the next hop.

Answer: A,C

NEW QUESTION # 71
Exhibit

Referring to the exhibit, PE-1 and PE-2 are getting route updates for VPN-B when neither of them service that VPN Which two actions would optimize this process? (Choose two.)

A. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the PEs.
B. Configure the family route-target statement on the RR.
C. Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement on the RR.
D. Configure the family route-target statement on the PEs.

Answer: B,C

Explanation:
BGP route target filtering can be configured on PE devices or on route reflectors (RRs). Configuring BGP route target filtering on RRs is more efficient and scalable, as it reduces the number of BGP sessions and updates between PE devices. To configure BGP route target filtering on RRs, the following steps are required:
Configure the family route-target statement under the BGP group or neighbor configuration on the RRs. This enables the exchange of the route-target address family between the RRs and their clients (PE devices).
Configure the resolution rib bgp.l3vpn.0 resolution-ribs inet.0 statement under the routing-options configuration on the RRs. This enables the RRs to resolve next hops for VPN routes using the inet.0 routing table.

NEW QUESTION # 72
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