What is the minimum number of wires needed to send data over a serial communication link layer?

What is the minimum number of wires required for sending data over a serial communications links?

A

2

B

1

C

4

D

3

E

None of the above

Data link layer retransmits the damaged frames in most networks. If the probability of a frame's being damaged is p, what is the mean number of transmissions required to send a frame if acknowledgements are never lost.

A

P I (K + 1)

B

KIK (1 + F)

C

1/ (1 - F)

D

K I (K - P)

E

None of the above

In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

A

equal to sum of other two

B

greater than sum of other two

C

less than sum of other two

D

none of the mentioned

Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.

A

3, 3, 1, 7

B

3, 2, 1, none

C

3, 2, 1, 7

D

3, 3, 2, none

E

All of the above

একই পদার্থ ও ব্যাসার্ধের দুটি তারের দৈর্ঘ্যের অনুপাত 1:2 । যদি সমান বল দ্বারা তার দুটিকে টানা হয়, তাহলে তার দুটির বিকৃতির অনুপাত কত? (Two wires of same material and same radius have the ratio of length 1:2 . If you pull the wires with same force, what will be the ratio of their strains?)

A

1:2

B

4:1

C

2:1

D

1:4

When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?

A

By default, all VLANs are allowed on the trunk.

B

No VLAN's are allowed, you must configure each VLAN by hand.

C

Only configured VLAN's are allowed on the link.

D

Only extended VLAN's are allowed by default.

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?

A

Supplied by the CSU\/DSU

B

By the far end router

C

By the clock rate command

D

By the Physical layer bits stream timing

What function does a serial interface perform in data communication?

A

Converts serial data into audio signals

B

Converts analog signals into digital signals

C

Converts parallel data into a stream of bits

D

Decodes incoming signals into computer data

E

None of the above

When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?

A

80

B

100

C

30

D

150

E

None of the above

Start and stop bits are used in serial communication for

A

Error detection

B

Error correction

C

Synchronization

D

Slowing down the communication

What is the minimum number of wires needed to send data over a serial communication link layer?

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