Question of the Day: July 31, 2009

Q: What is the range of the Private AS numbers allocated by IANA?

Highlight after < for the answer.

A: <IANA has reserved AS64512 through to AS65535 to be used as private ASNs


For more information on this visit this page:

http://www.apnic.net/services/services-apnic-provides/helpdesk/faqs/asn-faqs

Question of the Day: July 29, 2009

Q: In BGP dampening, what is the default value of the "reuse-value"?

Highlight after < for the answer.

A: <750


For more information on this visit this page:

http://www.avici.com/documentation/HTMLDocs/02223-06_revBA/BGP_Nd7.html

Question of the Day: July 28, 2009

Q: In BGP dampening, how much is the per-flap penalty points?

Highlight after < for the answer.

A: <1000

For more information on this visit this page:

http://www.avici.com/documentation/HTMLDocs/02223-06_revBA/BGP_Nd7.html

Question of the Day: July 27, 2009

Q: By default, BGP can perform load balancing over how many parallel links?

Highlight after < for the answer.

A: < One. You can change the number of parallel links by the "maximum-paths" command.

For more information on this visit this page:

http://www.avici.com/documentation/HTMLDocs/02223-10_revAB/BGP_Nd22.html

Question of the Day: July 26, 2009

Q: What is required for the command "default-information originate" to work?

Highlight after < for the answer.

A: <For the router to advertise itself as a default route to the other routers, it must have its own default route configured statically or learned dynamically. Adding the keyword "always" will force the router to advertise itself as a default route even if there is no default route learned by the advertising router.

For more information on this visit this page:

http://www.avici.com/documentation/HTMLDocs/02223-10_revAB/ospf8.html

Question of the Day: July 25, 2009

Q: What are the 5 STP switch port states?

Highlight after < for the answer.

A: <Blocking, Listening, Learning, Forwarding and Disabled

For more information on this visit this page:

http://en.wikipedia.org/wiki/Spanning_tree_protocol

Question of the Day: July 24, 2009

Q: What is default spanning-tree priority in Cisco switches?

Highlight after < for the answer.

A: <32768

For more information on this visit this page:

http://en.wikipedia.org/wiki/Spanning_tree_protocol

Question of the Day: July 23, 2009

Q: Name the metrics used in EIGRP.

Highlight after < for the answer.

A: <Delay, Bandwidth, Reliability and Load. MTU is not being used in metric calculation but is considered a metric.


For more information on this visit this page:

http://www.rhyshaden.com/eigrp.htm

Question of the Day: July 22, 2009

Q: What is the name of a device in IS-IS that is similar to a DR in OSPF that flood hello packets in a broadcast media?

Highlight after < for the answer.

A: <Designated Intermediate System (DIS)


For more information on this visit this page:

http://en.wikipedia.org/wiki/IS-IS

Question of the Day: July 21, 2009

Q: In EIGRP, what is a feasible successor?

Highlight after < for the answer.

A: <A Feasible Successor is a backup route to a destination which is kept in the Topology Table.

For more information on this visit this page:

http://www.rhyshaden.com/eigrp.htm

Question of the Day: July 20, 2009

Q: What are the three tables EIGRP uses to store data?

Highlight after < for the answer.

A: < Neighbor Table, Topology Table, Routing Table


For more information on this visit this page:

http://en.wikipedia.org/wiki/Enhanced_Interior_Gateway_Routing_Protocol

Question of the Day: July 19, 2009

Q: Name the OSPF Neighbor States.

Highlight after < for the answer.

A: < Down,Attempt,Init,Two-Way(2way),Exstart,Exchange,Loading,Full


For more information on this visit this page:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml

Question of the Day: July 18, 2009

Q: How many BGP processes can you run in a Cisco router?

Highlight after < for the answer.

A: <Only one process

Question of the Day: July 17, 2009

Q: What are the differences between DOT1Q and ISL?

Highlight after < for the answer.

A: < 1. Dot1q is IEEE standard, ISL is Cisco-proprietary. 2. Dot1q has the concept of a Native VLAN which doesn't tag the native vlan, ISL does not, it encapsulates all frames. 3. Dot1q tags the frame, ISL encapsulates it.



For more information on this visit this page:

http://www.thebryantadvantage.com/CCNACertificationExamWhySwitchesTrunkAndHow.htm

Question of the Day: July 16, 2009

Q: Into which of the BGP neighbor states must a neighbor stabilize before BGP Update messages may be sent?


Highlight after < for the answer.

A: < Established



For more information on this visit this page:

http://archive.networknewz.com/networknewz-10-20060403BGPAdjacencyStates.html

Question of the Day: July 15, 2009

Q: What is the IEEE standard that defines Fasthernet standard?


Highlight after < for the answer.

A: <IEEE 802.3u



For more information on this visit this page:

http://www.javvin.com/protocolFastE.html

Question of the Day: July 14, 2009

Q: What is the algorithm used in link-state protocols to calculate the best path?


Highlight after < for the answer.

A: < Dijkstra's Algorithm



For more information on this visit this page:

http://en.wikipedia.org/wiki/Link-state_routing_protocol

Question of the Day: July 13, 2009

Q: What is the default security-level of a PIX/ASA outside interface?


Highlight after < for the answer.

A: < Zero (0)

Question of the Day: July 12, 2009

Q: What are the 4 categories of BGP Attributes?


Highlight after < for the answer.

A: < 1) Well-known Mandatory 2) Well-known Discretionary 3) Optional Transitive 4) Optional Non-transitive

For more information on this visit this page:

http://www.brainbuzz.com/articles/files/border-gateway-protocol-a-982003-1304.asp

Question of the Day: July 11, 2009

Q: What is a virtual link?


Highlight after < for the answer.

A: < All areas in an OSPF autonomous system must be physically connected to the backbone area (area 0). In some cases where this physical connection is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. As mentioned above, you can also use virtual links to connect two parts of a partitioned backbone through a non-backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area.

For more information on virtual-links visit this page:

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9ee.shtml