JUNOS Enterprise Routing

Chapter Review Questions

1. Which of the following defines split horizon?

   1. Sending routes out the interface they were learned from

   2. Sending routes out the interface they were learned from with infinite metric

   3. Holding a recently unreachable route in the table for a fixed time to allow other routers to be notified

   4. Not sending routes out the interface they were learned from

2. When you configure RIP on a Juniper Networks router, how do you specify what interfaces the protocol should operate on?

   1. You use a network statement with a network mask

   2. You use a network statement with a wildcard mask

   3. You specify interface names and logical units explicitly as part of RIP neighbor configuration

   4. You use routing policy

   5. None of the above

3. What command displays the RIP routes a Juniper Networks router is sending out to a given interface?

   1. This is not possible given the LS nature of RIP

   2. show route protocol rip

   3. show route advertising-protocol rip <neighbor>

   4. show route receiving-protocol rip <neighbor>

4. Which type of router generates a Type 2 LSA?

   1. Internal

   2. ABR

   3. ASBR

   4. DR

5. Which is true regarding a stub area with no-summaries?

   1. The area uses a default to reach interarea destinations

   2. The area imports external routes as Type 7 LSAs

   3. The area does not receive Type 3 summary LSAs from the backbone

   4. The area has no OSPF routers in it

6. When you add a new OSPF router to a LAN, what factor(s) determine whether it will become the DR?

   1. Its priority setting

   2. The RID

   3. Whether any other routers are already operating on that LAN

   4. All of the above

7. What determines which route will be active when a given prefix is learned by multiple routing protocols?

   1. The lowest metric

   2. The path with the fewest hops

   3. The protocol with the highest numerical preference is chosen

   4. The protocol with the lowest numerical preference is chosen

8. Which syntax at an ABR would suppress individual summaries for routes in the 10.0/16 block in area 1 while replacing them with a single summary?

   1. [edit protocols ospf area 0.0.0.1]
      set area-range 10.0/16 restrict

   2. [edit protocols ospf area 0.0.0.0]
      set area-range 10.0/16

   3. [edit protocols ospf area 0.0.0.1]
      set area-range 10.0/16

   4. This is not possible; LSAs cannot be filtered without breaking LS protocol operation

9. Which is true regarding the overlay migration model?

   1. You first set the legacy IGP to be less preferred than the new IGP

   2. You first set the new IGP to be less preferred than the legacy IGP

   3. Route redistribution is needed to maintain connectivity through the migration

   4. A new backbone is needed

10. What is the primary mechanism for loop prevention in the redistribution model?

    1. A common LSDB ensures a loop-free topology

    2. Strict controls that ensure routes are not redistributed back to their originating IGP

    3. Setting the new IGP to be more preferred than the legacy IGP

    4. A careful mapping of metrics between originating and receiving IGPs

11. What types of authentication are supported in JUNOS software for OSPF?

    1. Simple password

    2. MD5 checksum

    3. Hitless key chain of MD5 keys/checksums

    4. All of the above

12. Which configuration will inject a default route into stub area 1?

    1. area 0.0.0.1 {
       stub default-metric 10 no-summaries;
       area-range 10.0.0.0/16 restrict;
       }

    2. area 0.0.0.0 {
       stub default-metric 10;
       }

    3. area 0.0.0.1 {
       stub no-summaries;
       area-range 10.0.0.0/16 restrict;
       }

    4. area 0.0.0.1 {
       stub default-metric;
       area-range 10.0.0.0/16 restrict;
       }