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Computer Networking

Computer Networking
Which of the following is not a standard synchronous communication protocol?

SMTP
SDLC
SLIP
None of these
PAS

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Computer Networking
The 802.5 standard implements a way for preventing collisions on the network. How are collisions prevented when using this standard?

Switched repeaters
Time sharing
CSMA/CD
Token passing
Collision detection

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Computer Networking
What is the default subnet mask for a class B network?

255.255.255.0
255.0.0.0
None of these
255.255.0.0
127.0.01

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Computer Networking
You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

255.254.0.0
255.255.255.255
255.248.0.0
255.252.0.0
255.240.0.0

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Computer Networking
What is the subnetwork number of a host with an IP address of 172.16.66.0/21?

172.16.36.0
172.16.64.0
172.16.48.0
172.16.0.0

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Computer Networking
A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

8 Kbps
None of these
32 Kbps
64 Kbps
128 Kbps.

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