Exam Prep Questions


Question 1

Which of the following commands would you use to designate that an interface will actively route IS-IS?

  • A. Router(config)# router isis

  • B. Router(config-if)# router isis

  • C. Router(config)# ip router isis

  • D. Router(config-if)# ip router isis

A1:

Answer D is correct. You specify which interfaces will be actively routing IS-IS by using the ip router isis command in interface configuration mode. Answer A is incorrect because this is the router isis command in router configuration mode. This command simply enables the IS-IS process. Answer B is incorrect because it is the wrong command in interface configuration mode. Answer C is incorrect because it is the correct command at the wrong prompt.

Question 2

Which of the main Integrated IS-IS “recognized WAN connection types is highly recommended by Cisco over all others for reasons of network stability and consistency?

  • A. Point-to-point

  • B. Dial-on-demand

  • C. Switched WAN

  • D. NBMA multipoint

A2:

Answer A is correct. Cisco highly recommends that you opt for point-to-point subinterface solutions and do not use NBMA multipoint when running IS-IS. Answer B is incorrect because dial-on-demand should be used in rare backup situations only. Answer C is incorrect because a full-mesh topology is the only feasible IS-IS over a multipoint network solution. However, the inherent possibilities of a full mesh becoming a partial mesh because of link failures or poor configuration make this scenario problematic and one to be avoided. Answer D is incorrect because this is another type of switched WAN solution and point-to-point is the preferred method.

Question 3

Which PDU packet type is utilized specifically for link-state acknowledgements and requests ?

  • A. Hello

  • B. CSNP

  • C. LSP

  • D. PSNP

A3:

Answer D is correct. This is the Partial Sequence Number PDU that is utilized for link-state acknowledgements and requests. Answer A is incorrect because these Hello PDU packets are used to generate and manage adjacencies. Answer B is incorrect because this is the Complete Sequence Number PDU that is used to propagate the IS's complete link-state topology database. Answer C is incorrect because the LSP is used to transport link-state information and contains an LSP header and variable-length TLV fields.

Question 4

Which one of the following statements is true concerning OSPF and IS-IS area design and configuration?

  • A. OSPF is a more scalable solution than OSI IS-IS.

  • B. OSPF builds its hierarchy with Level 1 and Level 2 routers where the borders are within the area routers themselves .

  • C. With Integrated IS-IS, the entire router is within the area and belongs to the area, not just to the individual interfaces.

  • D. IS-IS is designed around the backbone Area 0.

A4:

Answer C is correct. Integrated IS-IS builds its hierarchy with Level 1 and Level 2 routers where the borders are in the connections as opposed to within the area routers themselves. In other words, every IS-IS router belongs to exactly one Level 2 area. Answer A is incorrect because IS-IS is technically more scalable and flexible than OSPF. Answer B is incorrect because IS-IS uses Level 1 and Level 2 routers to build an area hierarchy. Answer D is incorrect because OSPF is built around the backbone Area 0.

Question 5

What is the term for the addressing scheme implemented by CLNS and IS-IS for identifying network devices and hosts ?

  • A. SNPA

  • B. LSP

  • C. ES-IS

  • D. NSAP

A5:

Answer D is correct. The NSAP is the type of addressing scheme implemented by CLNS and IS-IS for identifying network devices and hosts. Answer A is incorrect because it is the Subnetwork Point of Attachment ”the point at which subnetwork services are offered , usually a MAC address, Frame Relay DLCI, virtual circuit ID for X.25 or ATM, or HDLC. Answer B is incorrect because the LSP is the link-state packet used to flood information throughout the IS-IS routing domain. Answer C is incorrect because ES-IS is a discovery protocol and not an addressing scheme for identifying network devices.

Question 6

What acronym is used to represent the specific hello packet that is sent between two intermediate systems to establish adjacencies?

  • A. IIH

  • B. ISH

  • C. ESH

  • D. PDU

A6:

Answer A is correct. The IS-IS hello (IIH) is the hello packet utilized between two intermediate systems to establish adjacency . Answer B is incorrect because an ISH is a hello packet sent from an IS to an ES. Answer C is incorrect because ESH packets are sent by an ES to an IS (ES to IS Hello). Answer D is incorrect because a PDU is not a specific type of hello packet; rather a hello is a particular type of protocol data unit.

Question 7

Which of the following commands can be issued at the EXEC-mode prompt to find out information about specific IS-IS processes on your router?

  • A. show clns protocol

  • B. show clns interface

  • C. show ip route isis

  • D. show isis route

A7:

Answer A is correct. The show clns command displays general information concerning your CLNS network, but the show clns protocol command can be issued at the EXEC-mode prompt to find out information about specific IS-IS processes on your router. Answer B is incorrect because the show clns interface command is used to see individualized information on an interface-by-interface basis. Answer C is incorrect because the show ip route isis command enables you to see just the IS-IS routes from the IP routing table. Answer D is incorrect because the show isis route EXEC-mode command displays IS-IS Level 1 routes to all the other intra-area systems.

Question 8

Which of the following represent the fields that are used to identify a router in an IS-IS environment? (Choose all that apply.)

  • A. NSEL

  • B. Area ID

  • C. System ID

  • D. Subnet ID

A8:

Answers A, B, and C are correct. An IS-IS router is signified by the 1-byte NSAP-selector (NSEL), the 6-byte System ID, and the variable-length (1- to 13-byte) area address or ID. Answer D is incorrect because there is no Subnet ID in IS-IS addressing.

Question 9

Which of the following statements are characteristics that are shared between OSPF and IS-IS? (Choose all that apply.)

  • A. They are IGPs that are often hierarchical in their design.

  • B. They use a Bellman-Ford algorithm.

  • C. They establish adjacencies.

  • D. They construct link-state databases.

  • E. They are built around a core backbone supporting several areas.

A9:

Answers A, C, D, and E are correct. All four choices correctly describe the similarities between OSPF and IS-IS. Answer E addresses the fact that both protocols are structured around a backbone (or core) area, although IS-IS does not have an Area 0 like OSPF. Answer B is incorrect because both of these protocols use the same Dijkstra Shortest Path First algorithm; Bellman-Ford is a distance-vector algorithm.

Question 10

What do you call the NSAP when the NSEL field is set to 00 on a router configured with Integrated IS-IS?

  • A. PDU

  • B. NET

  • C. SNP

  • D. DIS

A10:

Answer B is correct. The NSAP becomes the NET when the NSEL field is set to 00. Answer A is incorrect because a PDU is a protocol data unit. Answer C is incorrect because the SNP is the control packet used with LSPs to successfully exchange IS-IS routing information. Answer D is incorrect because the DIS is the one elected router on the local network that is "logically" connected to all other nodes and sends the LSP information on behalf of its LAN.



Cisco BSCI Exam Cram 2 (Exam Cram 642-801)
CCNP BSCI Exam Cram 2 (Exam Cram 642-801)
ISBN: 0789730170
EAN: 2147483647
Year: 2003
Pages: 170

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