Why is variable length framing better than fixed length framing?
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SYLLABUS: Framing: fixed size framing, variable size framing, , Flow control, Error control ,Error detections Error correction:
block coding, linear block codes, cyclic codes: cyclic redundancy check, , Checksum: idea, one‟s complement internet check sum,
services provided to Network Layer, elementary Data link Layer protocols- Unrestricted Simplex protocol, Simplex Stop-and-Wait
Protocol, Simplex protocol for Noisy Channel.
Sliding window protocol: One bit, Go back N, Selective repeat-Stop and wait protocol, Data link layer in HDLC: configuration and
transfer modes, frames, control field, point to point protocol (PPP): framing transition phase, multiplexing, multi link PPP.
INTRODUCTION:
The data link layer needs to pack bits into frames, so that each frame is distinguishable from another.
Our postal system practices a type of framing. The simple act of inserting a letter into an envelope
separates one piece of information from another; the envelope serves as the delimiter.
Framing in the data link layer separates a message from one source to a destination, or from other
messages to other destinations, by adding a sender address and a destination address.
The destination address defines where the packet is to go; the sender address helps the recipient
acknowledge the receipt.
Fixed-Size Framing:
Frames can be of fixed or variable size. In fixed-size framing, there is no need for defining the boundaries of the
frames; the size itself can be used as a delimiter. An example of this type of framing is the ATM wide-area
network, which uses frames of fixed size called cells.
Variable-Size Framing:
In variable-size framing, we need a way to define the end of the frame and the beginning of the next.
Historically, two approaches were used for this purpose: a character-oriented approach and a bit-oriented
appro
block coding, linear block codes, cyclic codes: cyclic redundancy check, , Checksum: idea, one‟s complement internet check sum,
services provided to Network Layer, elementary Data link Layer protocols- Unrestricted Simplex protocol, Simplex Stop-and-Wait
Protocol, Simplex protocol for Noisy Channel.
Sliding window protocol: One bit, Go back N, Selective repeat-Stop and wait protocol, Data link layer in HDLC: configuration and
transfer modes, frames, control field, point to point protocol (PPP): framing transition phase, multiplexing, multi link PPP.
INTRODUCTION:
The data link layer needs to pack bits into frames, so that each frame is distinguishable from another.
Our postal system practices a type of framing. The simple act of inserting a letter into an envelope
separates one piece of information from another; the envelope serves as the delimiter.
Framing in the data link layer separates a message from one source to a destination, or from other
messages to other destinations, by adding a sender address and a destination address.
The destination address defines where the packet is to go; the sender address helps the recipient
acknowledge the receipt.
Fixed-Size Framing:
Frames can be of fixed or variable size. In fixed-size framing, there is no need for defining the boundaries of the
frames; the size itself can be used as a delimiter. An example of this type of framing is the ATM wide-area
network, which uses frames of fixed size called cells.
Variable-Size Framing:
In variable-size framing, we need a way to define the end of the frame and the beginning of the next.
Historically, two approaches were used for this purpose: a character-oriented approach and a bit-oriented
appro
vishalkk:
please mark on brilliant answer
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