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Juniper JN0-661 Exam Practice Questions (P. 4)

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Question #16
Click the Exhibit button.
user@R1> show ospf interface detail
Interface State Area DR ID BDR ID Nbcs
xe-0/0/1.0 BDR 0.0.0.0 2.169.37.12 11.244.245.215 1
Type LAN, address 192.161.27.11, Mask 255.255.255.248, MTU 4460, Cost 40
DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128
Hello 10, Dead 40, ReXmit 5, Not Stub
fe-0/2/1.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0
Type P2P, Address 0.0.0.0, Mask 0.0.0.0, MTU 1500, Cost 2604

Adj count 0 -
Hello 10, Dead 40, ReXmit 5, Not stub
Auth type: MDS, Active key ID 3, Start time 2013 Jul 19 10:00:00 PST

IPsec SA Name: sa -
user@R2> show ospf interface detail
Interface State Area DR ID BDR ID Nbcs
xe-1/1/1.0 BDR 0.0.0.0 192.168.37.12 11.244.245.216 1
Type LAN, address 192.161.27.12, Mask 255.255.255.248, MTU 4460, Cost 40
DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128
Hello 3, Dead 9, ReXmit 5, Not stub
fe-2/2/2.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0
Type P2P, address 0.0.0.0, Mask 0.0.0.0, MTU 1500, Cost 2604

Adj count 0 -
Hello 10, Dead 40, ReXmit 5, Not Stub
Auth type: MDS, Active key ID 3, Start time 2013 Jul 19 10:00:00 PST

IPsec SA Name: sa -
Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)
  1. A
    There is a mismatch in the dead interval parameter between routers R1 and R2.
  2. B
    There is a mismatch in the hold timer parameter between routers R1 and R2.
  3. C
    There is a mismatch in the hello interval parameter between routers R1 and R2.
  4. D
    There is a mismatch in the poll interval parameter between routers R1 and R2.

Correct Answer:
AC
If the timers are equal, which they are by default in JUNOS (for LAN/P2P the Hello = 10s and Dead = 40s), the neighbors will establish a relationship (at least on 1 side).
There is a Hello and Dead parameter mismatch. On R1 we see:
On R1 we see:
DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128
Hello 10, Dead 40, ReXmit 5, Not Stub
while on R2 we see:
DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128
Hello 3, Dead 9, ReXmit 5, Not stub
References:
https://inetzero.com/what-is-your-ospf-neighbor-doing-adjancency-problems-in-ospf/

Question #17
Which OSPFv3 router ID is valid?
  1. A
    192.168.1.1
  2. B
    ::192.168.1.1
  3. C
    0.0.0.0
  4. D
    2008:db8::1

Correct Answer:
A
OSPFv3 Router IDs, Area IDs, and LSA link-state IDs remain at the OSPFv2 IPv4 size of 32 bits.
References: Network Configuration Example OSPF Version 3 for IPv6 Feature Guide, page 3

Question #18
You are working with a new MPLS network that is using the default EXP classifier and default schedules. A small amount of traffic is being placed in the assured forwarding class. No other traffic is passing through the network at this time.
In this scenario, what happens to the traffic that is being placed in the assured forwarding class?
  1. A
    The traffic is reclassified to the best effort forwarding class and is forwarded.
  2. B
    The traffic remains in the assured forwarding class and is forwarded.
  3. C
    The traffic is reclassified to the network control forwarding class and is forwarded.
  4. D
    The traffic remains in the assured forwarding class and is dropped.

Correct Answer:
B
References:
https://www.juniper.net/documentation/en_US/junos15.1/topics/concept/forwarding-classes-default-cos-config-guide.html

Question #19
You are connecting your OSPF router to your customer's RIP router and redistributing the customer's routes into your OSPF domain. Your OSPF routes is part of an NSSA and the ABR is injecting an OSPF default route, which you have advertised to your customer. After committing the configuration, you notice a routing loop between your OSPF router and the customer's RIP router.
Which action must you perform on your OSPF router to solve this problem?
  1. A
    Enable Type 7-to-Type 5 LSA conversion.
  2. B
    Set the customer-facing interface to passive.
  3. C
    Convert the area to a stub area.
  4. D
    Change the OSPF external route preference.

Correct Answer:
D
Avoid routing loops by changing the OSPF external route preference.
Incorrect Answers:
A: If multiple NSSA ABR routers are present, it is recommended that not all ABRs perform Type 7-to-5 translation to avoid routing loops.
B: We would have to make the interface on the RIP router, the customer router, passive, not the customer-facing interface on the OSPF router.
Note: By default RIP broadcasts are sent from all interfaces. RIP allows us to control this behavior. We can configure which interface should send RIP broadcast or which not. Once we mark any interface as passive interface, RIP will stop sending updates from that interface.
References:
https://www.juniper.net/documentation/en_US/junos15.1/topics/topic-map/ospf-stub-and-not-so-stubby-areas.html

Question #20
Click the Exhibit button.

Referring to the exhibit button, you are asked to ensure that traffic destined for the 5.5.5.0/24 network must use the LSP named Top.
Which two actions would you perform to accomplish this task? (Choose two.)
  1. A
    Apply the policy as an import policy for BGP on R1.
  2. B
    Create a routing policy that matches the route 5.5.5.0/24 with an action of install-nexthop lsp Top.
  3. C
    Create a routing policy that matches the route 5.5.5.0/24 with an action of next-hop Top.
  4. D
    Apply the policy to the forwarding table on R1.

Correct Answer:
BD
B: The install-nexthop command selects a specific label-switched path (LSP), or select an LSP from a set of similarly named LSPs as the traffic destination for the configured community.
D: You can apply an export routing policy to a forwarding table. You include the export statement: export [ policy-names ];
References:
https://www.juniper.net/documentation/en_US/junos14.1/topics/reference/configuration-statement/install-nexthop-edit-policy-options.html

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