Juniper Juniper Certifications JN0-643 Questions & Answers

• Question 271:

  You are asked to configure graceful restart in your network.

  Which OSPF LSA type would you expect to see in the LSDB?

  A. Type 8

  B. Type 9

  C. Type 10

  D. Type 11

  Correct Answer: B

• Question 272:

  -- Exhibit -- Exhibit -

  

  Click the Exhibit button.

  Referring to the exhibit, which answer is correct?

  A. R2 is the DR and R1 is the BDR.

  B. R4 is the DR and R2 is the BDR.

  C. R2 is the DR and R3 is the BDR.

  D. R3 is the DR and R2 is the BDR.

  Correct Answer: C

• Question 273:

  Which statement is true about using an OSPF import policy?

  A. Import policies are not allowed in OSPF, applying the policy will do nothing.

  B. Applying an import policy to OSPF may block normal LSA flooding.

  C. Import policies are allowed only for external route types.

  D. Applying this policy will cause a commit failure.

  Correct Answer: C

• Question 274:

  -- Exhibit

  

  -- Exhibit -Click the Exhibit button.

  Referring to the exhibit, which type of LSA will be seen on router A for routes originating in Customer A's network?

  A. Type 7 LSA

  B. Type 2 LSA

  C. Type 5 LSA

  D. Type 1 LSA

  Correct Answer: C

• Question 275:

  Which statement is true regarding OSPF multi-area adjacencies?

  A. A type 3 (stub) link is advertised for a multi-area adjacency.

  B. Configuring a multi-area adjacency allows the corresponding link to be considered an interarea link, so it will be less preferred over an intra-area link.

  C. One logical interface will be a primary link, and the other configured as a secondary link; the secondary link will be established as an unnumbered point-to-point interface.

  D. A DR and a BDR will be elected over the secondary interface, because it is not point-to-point.

  Correct Answer: C

• Question 276:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, which two statements are correct? (Choose two.)

  A. Traffic destined for R2 will be blackholed.

  B. Transit traffic will follow the R1-R2-R4 path.

  C. Traffic destined for R2 will reach R2.

  D. Transit traffic will follow the R1-R3-R4 path.

  Correct Answer: CD

• Question 277:

  -- Exhibit -[edit protocols ospf]

  user@R2# show

  area 0.0.0.6 {

  nssa {

  default-lsa default-metric 10;

  area-range 184.23.12.0/24;

  }

  interface ge-1/1/4;

  }

  [edit protocols ospf]

  user@R2# show ospf database

  OSPF database, Area 0.0.0.0

  Type ID Adv Rtr Seq Age Opt Cksum Len

  Router *192.168.0.2 192.168.0.2 0x80000004 749 0x22 0x87c2 60 Router 192.168.0.3 192.168.0.3 0x80000004 399 0x22 0x94b5 60 Summary *10.0.0.0 192.168.0.2 0x80000003 19 0x22 0xe2e4 28 Summary *192.168.0.1 192.168.0.2

  0x80000002 1100 0x22 0xbda7 28

  OSPF database, Area 0.0.0.6

  Type ID Adv Rtr Seq Age Opt Cksum Len

  Router 192.168.0.1 192.168.0.1 0x80000004 404 0x20 0x76db 60 Router *192.168.0.2 192.168.0.2 0x80000003 1802 0x20 0x319b 48 Summary *11.0.0.0 192.168.0.2 0x80000002 2504 0x20 0xf5d3 28 Summary *192.168.0.2 192.168.0.2

  0x80000003 2153 0x20 0xc5a0 28 Summary *192.168.0.3 192.168.0.2 0x80000002 398 0x20 0xc79d 28 NSSA *0.0.0.0 192.168.0.2 0x80000001 11 0x20 0xcbf1 36 NSSA 184.23.12.0 192.168.0.1 0x80000002 447 0x28 0xb93f 36 OSPF AS

  SCOPE link state database Type ID Adv Rtr Seq Age Opt Cksum Len

  Extern *184.23.12.0 192.168.0.2 0x80000003 11 0x22 0x28d6 36 -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, which two statements are correct? (Choose two.)

  A. R2 injects a Type 3 LSA for 184.23.12.0/24 into the backbone.

  B. R2 is an ABR.

  C. R2 injects a Type 5 LSA for 184.23.12.0/24 into the backbone.

  D. R2 is an ASBR.

  Correct Answer: BC

• Question 278:

  -- Exhibit

  

  -- Exhibit -

  Click the Exhibit button.

  Referring to the exhibit, which LSA type will Router R2 inject into Area 1?

  A. Type 3 LSA

  B. Type 4 LSA

  C. Type 5 LSA

  D. Type 7 LSA

  Correct Answer: A

• Question 279:

  Which statement is true about LLDP?

  A. It allows you to split a broadcast domain into multiple isolated broadcast subdomains.

  B. It dynamically manages VLAN registration in a LAN.

  C. It maintains a separate spanning-tree instance for each VLAN.

  D. It is a Layer 2 protocol that facilitates network and neighbor discovery.

  Correct Answer: D

• Question 280:

  Which CoS feature avoids congestion in a device by limiting traffic on ingress interfaces?

  A. rewrite rule

  B. scheduler

  C. drop profile

  D. policer

  Correct Answer: A