Data link layer acknowledgement

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I'm confused with some concepts please help me out,

1. Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does not have any ack field.

So does that mean data link layer always depend on transport layer for acknowledgement processing?

2. On receiving a packet from any local nodes does router gives acknowledgement in return? If they do then how it is possible as they operate only up to network layer and ack generate in transport layer?

router ethernet osi

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asked 4 hours ago

Nick

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up vote
2
down vote

favorite

I'm confused with some concepts please help me out,

1. Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does not have any ack field.

So does that mean data link layer always depend on transport layer for acknowledgement processing?

2. On receiving a packet from any local nodes does router gives acknowledgement in return? If they do then how it is possible as they operate only up to network layer and ack generate in transport layer?

router ethernet osi

share|improve this question

asked 4 hours ago

Nick

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

up vote
2
down vote

favorite

up vote
2
down vote

favorite

I'm confused with some concepts please help me out,

1. Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does not have any ack field.

So does that mean data link layer always depend on transport layer for acknowledgement processing?

2. On receiving a packet from any local nodes does router gives acknowledgement in return? If they do then how it is possible as they operate only up to network layer and ack generate in transport layer?

router ethernet osi

share|improve this question

asked 4 hours ago

Nick

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

I'm confused with some concepts please help me out,

1. Data link layer manage flow control hop to hop. Flow control requires acknowledgement receiving but If we observe data link layer header, it does not have any ack field.

So does that mean data link layer always depend on transport layer for acknowledgement processing?

2. On receiving a packet from any local nodes does router gives acknowledgement in return? If they do then how it is possible as they operate only up to network layer and ack generate in transport layer?

router ethernet osi

router ethernet osi

share|improve this question

asked 4 hours ago

Nick

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 4 hours ago

Nick

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

share|improve this question

asked 4 hours ago

Nick

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 4 hours ago

Nick

112

asked 4 hours ago

Nick

112

112

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

New contributor

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

Nick is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

add a comment | 

1 Answer
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The Data link layer in Ethernet (802.3) contains two sublayers :

• Media Access Control (MAC)


• Logical Link Control (LLC)

LLC does not provide flow control. Incorrect packets are detected and discarded, and the retransmissions rely on higher layer protocols.

The idea behind this behaviour is that wired networks have a very low error ratio, so an ACK and retransmission mechanism is unnecesary and make the network slower.

---

In 802.11 there is flow control and error management.

It isn't in the LLC sublayer. It is part of the CSMA/CA MAC protocol.

In CSMA/CA The receiving node sends an ACK after receiving a packet. If the ACK is not received, the packet is considered lost and the sender tries a retransmission.

Wireless networks have higher error ratios. It is necessary to have it.

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answered 3 hours ago

jcbermu

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
3
down vote

The Data link layer in Ethernet (802.3) contains two sublayers :

• Media Access Control (MAC)


• Logical Link Control (LLC)

LLC does not provide flow control. Incorrect packets are detected and discarded, and the retransmissions rely on higher layer protocols.

The idea behind this behaviour is that wired networks have a very low error ratio, so an ACK and retransmission mechanism is unnecesary and make the network slower.

---

In 802.11 there is flow control and error management.

It isn't in the LLC sublayer. It is part of the CSMA/CA MAC protocol.

In CSMA/CA The receiving node sends an ACK after receiving a packet. If the ACK is not received, the packet is considered lost and the sender tries a retransmission.

Wireless networks have higher error ratios. It is necessary to have it.

share|improve this answer

answered 3 hours ago

jcbermu

3,878817

add a comment | 

up vote
3
down vote

The Data link layer in Ethernet (802.3) contains two sublayers :

• Media Access Control (MAC)


• Logical Link Control (LLC)

LLC does not provide flow control. Incorrect packets are detected and discarded, and the retransmissions rely on higher layer protocols.

The idea behind this behaviour is that wired networks have a very low error ratio, so an ACK and retransmission mechanism is unnecesary and make the network slower.

---

In 802.11 there is flow control and error management.

It isn't in the LLC sublayer. It is part of the CSMA/CA MAC protocol.

In CSMA/CA The receiving node sends an ACK after receiving a packet. If the ACK is not received, the packet is considered lost and the sender tries a retransmission.

Wireless networks have higher error ratios. It is necessary to have it.

share|improve this answer

answered 3 hours ago

jcbermu

3,878817

add a comment | 

up vote
3
down vote

up vote
3
down vote

The Data link layer in Ethernet (802.3) contains two sublayers :

• Media Access Control (MAC)


• Logical Link Control (LLC)

LLC does not provide flow control. Incorrect packets are detected and discarded, and the retransmissions rely on higher layer protocols.

The idea behind this behaviour is that wired networks have a very low error ratio, so an ACK and retransmission mechanism is unnecesary and make the network slower.

---

In 802.11 there is flow control and error management.

It isn't in the LLC sublayer. It is part of the CSMA/CA MAC protocol.

In CSMA/CA The receiving node sends an ACK after receiving a packet. If the ACK is not received, the packet is considered lost and the sender tries a retransmission.

Wireless networks have higher error ratios. It is necessary to have it.

share|improve this answer

answered 3 hours ago

jcbermu

3,878817

The Data link layer in Ethernet (802.3) contains two sublayers :

• Media Access Control (MAC)


• Logical Link Control (LLC)

LLC does not provide flow control. Incorrect packets are detected and discarded, and the retransmissions rely on higher layer protocols.

The idea behind this behaviour is that wired networks have a very low error ratio, so an ACK and retransmission mechanism is unnecesary and make the network slower.

---

In 802.11 there is flow control and error management.

It isn't in the LLC sublayer. It is part of the CSMA/CA MAC protocol.

In CSMA/CA The receiving node sends an ACK after receiving a packet. If the ACK is not received, the packet is considered lost and the sender tries a retransmission.

Wireless networks have higher error ratios. It is necessary to have it.

share|improve this answer

answered 3 hours ago

jcbermu

3,878817

share|improve this answer

share|improve this answer

answered 3 hours ago

jcbermu

3,878817

answered 3 hours ago

jcbermu

3,878817

answered 3 hours ago

jcbermu

3,878817

3,878817

add a comment | 

add a comment | 

Nick is a new contributor. Be nice, and check out our Code of Conduct.

 

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