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291 What is true about
Link-State protocols?
A.) They maintain a more complex table than distant vector
protocols
B.) They maintain a less complex table than distant vector
protocols
C.) They use routing ports
D.) The maintain backup copies of the IOS
Ans A
Whereas the distance vector algorithm has non-specific
information about distant networks and no knowledge of distant
routers, a link-state routing algorithm maintains full knowledge
of distant routers and how they interconnect.
292 The maximum distance on a 10BaseT network from the hub to
a workstation is which of the following?
A.) 500 meters
B.) 1000 meters
C.) 100 meters
D.) 1500 meters
Ans C
The standard for 10BaseT networks is 100 meters, or
approximately 330 feet.
293 Which of the following use PVCs at layer 2?
A.) X.25
B.) HDLC
C.) Frame relay
D.) ISDN
Ans C
Of the above choices, only Frame relay uses Permanent Virtual
Circuits (PVCs) at layer 2. PVC is the key word in this
question.
294 What is the routing algorithm used by RIP and IGRP?
A.) OSPF
B.) Link-state
C.) Dynamic
D.) Distance Vector
Ans D
Distance vector-based routing algorithms (also known as
Bellman-Ford algorithms) pass periodic copies of a routing table
from router to router. Regular updates between routers
communicate topology changes. Each router receives a routing
table from it's direct neighbor and increments all learned
routes by one. By this method, each router learns the
internetwork topology via second hand information.
295 Which layer is responsible for negotiating data transfer
syntax?
A.) Network
B.) Session
C.) Application
D.) Transport
E.) Presentation
Ans E
The Presentation layer performs the following: Manages data
representation conversions, or data transfer syntax. For
example, the Presentation layer would be responsible for
converting from EDCDIC to ASCII. Data compression,
decompression, encryption, and decryption are presentation
layer. Presentation layer standards include MPEG, MIDI, PICT,
TIFF, JPEG, ASCII, and EBCDIC
296 What are hold-downs used for?
A.) To prevent regular update messages from reinstating a route
that has come back up
B.) Information received on an interface cannot be sent back out
the same interface
C.) To prevent regular update messages from reinstating a route
that has gone down
D.) To hold the routing table from being sent to another router
Ans C
Hold-Down Timers - Routers ignore network update information for
some period.
297 Which of the following protocols are used for logical
network addressing?
A.) IP
B.) TCP
C.) ARP
D.) ICMP
E.) RARP
F.) BootP
Ans A
Internet Protocol - IP provides routing and a single interface
to the upper layers. No upper layer protocol and now lower layer
protocol have any functions relating to routing. IP receives
segments from the transport layer and fragments them into
packets including the hosts IP address. IP addressing is
logical, not physical.
298 Which can be logged by IPX extended access lists?
A.) source address
B.) protocol
C.) source socket
D.) access list number
E.) destination socket
F.) destination address
Ans A B C D E F
All of the above can be logged by IPX extended access lists.
299 Put the following steps of encapsulation into the correct
order:
1) The data is broken into segments to be organized
2) Frames are converted to 1s and 0s to be put on the wire
3) Packets are converted into frames
4) Information that users enter is converted into data
5) The segments are changed to packets to be routed
A.) 4, 1, 3, 2, 5
B.) 4, 5, 1, 3, 2
C.) 2, 3, 1, 4, 5
D.) 4, 1, 5, 3, 2
Ans D
Follow the steps through the Layers of the OSI model to get the
answer. Watch the key words in each line to help you determine
the steps.
300 Which port numbers are used by TCP and UDP to set up
sessions with other hosts?
A.) 1024 and above
B.) 6 and 17 respectively
C.) 1-25
D.) 6-17
Ans A
TCP and UDP use random port number above 1023 for establishing
communications.
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