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Question

Comments

Option B ??

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C ... ??

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@Kampil ... I think ..point number 2 is not correct for data link layer ... because think about TCP/UDP protocol at transport layer where in case of UDP ... data may get lost.

What do you say ??

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Yes @kapllp u r right option c even it assures that no frame were lost

Answer 1

option A is correct : in current scenerio we use full duplex to get improved throughput and reliability by eliminating collision of frames 

option B is correct:we have sliding windows protocol to achieve this

option C is correct:  The Network Layer wants to be sure that all messages it sends, will be delivered correctly (e.g., none lost, no corruption). .and dll delivers it's best effort

option D is also correct: 

Comments

@asu it is not necessary to send data always in full duplex na "so frames is always full duplex" 

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@asu,

It is saying always full duplex which can be there in possible scenario. But

HDLC and PPP both sometimes use half duplex  and full duplex

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I ASSUMED IN CURRENT SCENERIO

Answer 2

Q.NO-2

Answer :: Option -D

Q.No::3

Answer:: transport Layer

Q.No 4::

Answer::

Option :A

Error detection can be done with CRC in data link layera and assurity.