item feedback report

11/8/13 Item Feedback Report

https://assessment.netacad.net/virtuoso/delivery/pub-doc/lti_item_level_feedback.shtml?EXAM_RESULT_ID=125146225&SLIX=R1FTSflfFNj01r74GBtpsZZfQ 1/5

Assessment Results Item Feedback Report

Routing and Switching Essentials (Version 5.0) - RSE Chapter 8 Exam

Below is the feedback on items for which you did not receive full credit. Some interactive items may not display your response.

Subscore: Domain Knowledge - Weighted Score

1 Which OSPF component is identical in all routers in an OSPF area after convergence?

CorrectResponse

YourResponse

Each OSPF router views the network differently as the root of a unique SPF tree. Each router builds adjacencies based on its ownposition in the topology. Each routing table in the area is developed individually through the application of the SPF algorithm. Thelink-state database for an area, however, must reflect the same information for all routers.

This item references content from the following areas:

Routing and Switching Essentials

8.1.1 Open Shortest Path First

2 Which three statements describe features of the OSPF topology table? (Choose three.)

CorrectResponse

YourResponse

The topology table on an OSPF router is a link-state database (LSDB) that lists information about all other routers in the network,

and represents the network topology. All routers within an area have identical link-state databases, and the table can be viewedusing the show ip ospf database command. The EIGRP topology table contains feasible successor routes. This concept is notused by OSPF. The SPF algorithm uses the LSDB to produce the unique routing table for each router which contains the lowestcost route entries for known networks.



8.1.1 Open Shortest Path First

4 Which OPSF packet contains the different types of link-state advertisements?

CorrectResponse

YourResponse

Link-state update (LSU) packets contain different types of link-state advertisements (LSAs). The LSUs are used to reply to link-staterequests (LSRs) and to announce new information.

adjacency database

link-state database

routing table

SPF tree

It is a link-state database that represents the network topology.

Its contents are the result of running the SPF algorithm.

When converged, all routers in an area have identical topology tables.

The topology table contains feasible successor routes.

The table can be viewed via the show ip ospf database command.

After convergence, the table only contains the lowest cost route entries for all known networks.

hello

DBD

LSR

LSU

LSAck

https://assessment.netacad.net/virtuoso/delivery/pub-doc/exam_result.shtml?THEME=rapport&STYLE=base&SLIX=R1FTSflfFNj01r74GBtpsZZfQ&ER_ID=125146225





8.1.2 OSPF Messages

5 A router is participating in an OPSFv2 domain. What will always happen if the dead intervalexpires before the router receives a hello packet from an adjacent DROTHER OPSF router?

CorrectResponse

YourResponse

On Cisco routers the default dead interval is 4 times the hello interval, and this timer has expired in this case. SPF does notdetermine the state of neighbor routers; it determines which routes become routing table entries. A DR/DBR election will notalways automatically run; this depends on the type of network and on whether or not the router no longer up was a DR or BDR.



8.1.2 OSPF Messages

6 What are the two purposes of an OSPF router ID? (Choose two.)

CorrectResponse

YourResponse

OSPF router ID does not contribute to SPF algorithm calculations, nor does it facilitate the transition of the OSPF neighbor state toFull. Although the router ID is contained within OSPF messages when router adjacencies are being established, it has no bearingon the actual convergence process.



8.2.1 OSPF Router ID

11 Which three statements describe the similarities between OSPFv2 and OSPFv3? (Choose three.)

CorrectResponse

YourResponse

Only OSPFv2 messages are sourced from the IP address of the exit interface; OSPFv3 uses the link-local address of the exitinterface. Only OSPFv3 uses IPsec; OSPFv2 uses plain text or MD5 authentication. Unicast routing is enabled by default only withOSPFv2.



8.3.1 OSPFv2 vs. OSPFv3

OSPF will run a new DR/BDR election.

SPF will run and determine which neighbor router is "down".

A new dead interval timer of 4 times the hello interval will start.

OSPF will remove that neighbor from the router link-state database.

to facilitate the establishment of network convergence

to uniquely identify the router within the OSPF domain

to facilitate the transition of the OSPF neighbor state to Full

to facilitate router participation in the election of the designated router

to enable the SPF algorithm to determine the lowest cost path to remote networks

They both are link-state protocols.

They both use the exit interface address as the source address when sending OSPF messages.

They both share the concept of multiple areas.

They both support IPsec for authentication.

They both use the same DR/BDR election process.

They both have unicast routing enabled by default.



12 What does a Cisco router use automatically to create link-local addresses on serial interfaceswhen OSPFv3 is implemented?

CorrectResponse

YourResponse

Since serial interfaces do not have MAC addresses, OSPFv3 automatically assigns a link-local address to them derived from the

first available MAC address from the pool of Ethernet interface addresses on the router. A FE80::/10 prefix is added. The router thenapplies the EUI-64 process to the MAC address by inserting FFFE into the middle of the existing 48-bit address and flipping theseventh bit.



8.3.2 Configuring OSPFv3

19Fill in the blank.OSPF uses bandwidth as a metric.

The OSPF metric is cost. The lowest cost path to a remote destination is the preferred path and is installed in the routing table.



8.2.3 OSPF Cost

20Fill in the blank. Do not use abbreviations.

To quickly verify OSPFv3 configuration information including the OSPF process ID, the router ID, and the interfaces enabled for OSPFv3, youneed to issue the command show ipv6 ospf neighbor .



8.3.3 Verify OSPFv3

21Question as presented:

the highest MAC address available on the router, the FE80::/10 prefix, and the EUI-48 process

the FE80::/10 prefix and the EUI-48 process

the MAC address of the serial interface, the FE80::/10 prefix, and the EUI-64 process

an Ethernet interface MAC address available on the router, the FE80::/10 prefix, and the EUI-64 process





8.2.3 OSPF Cost

8.2.4 Verify OSPF

Your response:

item feedback report

Documents