Answer / guest

Answer: C

Internet Control Message Protocol - ICMP is a management
protocol and

messaging service provider for IP. Its messages are carried
as IP

datagrams.

ICMP is used in the following events:

Destination Unreachable - If a router cannot send an IP
packet any

further, it uses an ICMP echo to send a message back to the
sender

notifying it that the remote node is unreachable.

Buffer Full - If a routers memory buffer is full ICMP will
send out a

message to the originator.

Hops - Each IP datagram is assigned a path. This consists of
hops. If it

goes through the maximum number of hops, the packet is
discarded and the

discarding router sends an ICMP echo to the host.

Ping - Ping use ICMP echo message to check connectivity.

CO is an acronym for which of the following? A.) Central Office B.) Capital Office C.) Central Operator D.) Company Office

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Which of the following use PVCs at layer 2? A.) X.25 B.) HDLC C.) Frame relay D.) ISDN

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You have a Class B network address divided into 30 subnets. You will add 25 new subnets within the next year. You need 600 host IDs for each subnet. Which subnet mask should you use? A.) 255.254.0.0 B.) 255.192.0.0 C.) 255.255.252.0 D.) 255.255.248 0

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Which of the following is a connectionless protocol at the Transport layer? A.) UDP B.) ARP C.) ICMP D.) RARP E.) IP F.) FTP

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You have two Cisco routers setup back-to-back in a lab using DTE/DCE cables. To which router would you add the clockrate command? A.) The serial port on the DCE router B.) The Ethernet port on the DTE router C.) The Ethernet port on the DCE router D.) The serial port on the DTE router

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What is the function of application layer in networking?

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Which OSI layer incorporates the MAC address and the LLC? A.) Data link B.) Network C.) Physcial D.) Transport

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What is ospf? Describe it.

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What is the attenuation?

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In which three situations is a hold down timer reset? (Choose three) A. when the hold down timer expires B. when infinity is finally defined as some maximum number C. when the router exchanges update summaries at area borders D. when the router detects faulty LSPs propagating through the internetwork E. when another update is received indicating a new route with a better metric F. when another update is received indicaing the original route to the network has been restored G. when the router receives a processing task proportional to the number of links in the internetwork

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Which of the following is an example of the Datalink Layer? A.) LLC B.) TCP C.) SQL D.) IPX E.) Token Ring F.) MAC

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What is the usage of service password encryption?

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