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NO.1 A receiving host computes the checksum on a frame and determines that the
frame is
damaged.
The frame is then discarded. At which OSI layer did this
happen?
A. session
B. transport
C. network
D. data link
E.
physical
Answer: D
NO.2 Which of the following describes the roles of
devices in a WAN? (Choose three.)
A. A CSU/DSU terminates a digital local
loop.
B. A modem terminates a digital local loop.
C. A CSU/DSU terminates
an analog local loop.
D. A modem terminates an analog local loop.
E. A
router is commonly considered a DTE device.
F. A router is commonly
considered a DCE device.
Answer: A,D,E
NO.3 A network interface port
has collision detection and carrier sensing enabled on a
shared
twisted
pair network. From this statement, what is known about the
network interface port?
A. This is a 10 Mb/s switch port.
B. This is a 100
Mb/s switch port.
C. This is an Ethernet port operating at half duplex.
D.
This is an Ethernet port operating at full duplex.
E. This is a port on a
network interface card in a PC.
Answer: C
NO.4 A network administrator
is verifying the configuration of a newly installed host by
establishing
an
FTP connection to a remote server. What is the highest
layer of the protocol stack that the network
administrator is using for this
operation?
A. application
B. presentation
C. session
D.
transport
E. internet
F. data link
Answer: A
NO.5 Which layer in
the OSI reference model is responsible for determining the availability of
the
receiving program and checking to see if enough resources exist for that
communication?
A. transport
B. network
C. presentation
D.
session
E. application
Answer: E