CSCI 4500: Chapter 3: Transport
Layer
1. What are
logical communication(btw app processes),
trans- port
end sys- tems(sender/receiver), and the
services and
internet(TCP/UDP)
protocols?
2. sender breaks application messages into segments, passe
to
network layer
3. receiver reassembles segments into messages, passes to
appli-
cation layer
4. analogy for 7. transport layer actions receiver
the transport
layer
5. transport vs net-
work layer
6. transport layer
actions sender
1/
44
, CSCI 4500: Chapter 3: Transport
Layer
segment from IP checks
header values
Network layer:
logical
communication
between hosts
Transport layer:
logical
communication
between process- es
(relies on,
enhances, network
layer services)
is passed
an
application
layer
message
determines
segment
header
fields
values
creates
segment
passes segment to IP
r
e
c
e
i
v
e
s
2/
44
, CSCI 4500: Chapter 3: Transport Layer | Summaries
extracts application-layer message
demultiplexes message up to application via socke
8. TCP(Transmis- reliable in-order delivery
sion Control congestion control
Protocol) flow control
connection setup
9. UDP (User Data- A no-frills, lightweight transport protocol,
gram Protocol) providing min- imal services, DNS uses this
protocol, connectionless, unreliable, unordered
delivery, best effort(UDP segments may be
lost/delivered out-of-order to app), [RFC768]
10. Services not
pro- vided by delay guarantees
TCP and UDP bandwidth guarantees
11. multiplexing A form of transmission that allows multiple signals
to
travel simultaneously over one medium
12. multiplexing handle data from multiple sockets, add transport
at sender head- er(leaving the center)
13. demultiplexing A process that converts the multiplexed signals to
inde-
pendent signals
14. demultiplexing use header info to deliver received segments to
at receiver correct socket(coming back to center)
15. multiplexing multiplexing — receiver side(happens at
vs transmitter side) demultiplexing — transmitter
demultiplexing side(happens at receiver side)
3/
44
, CSCI 4500: Chapter 3: Transport Layer | Summaries
4/
44
Layer
1. What are
logical communication(btw app processes),
trans- port
end sys- tems(sender/receiver), and the
services and
internet(TCP/UDP)
protocols?
2. sender breaks application messages into segments, passe
to
network layer
3. receiver reassembles segments into messages, passes to
appli-
cation layer
4. analogy for 7. transport layer actions receiver
the transport
layer
5. transport vs net-
work layer
6. transport layer
actions sender
1/
44
, CSCI 4500: Chapter 3: Transport
Layer
segment from IP checks
header values
Network layer:
logical
communication
between hosts
Transport layer:
logical
communication
between process- es
(relies on,
enhances, network
layer services)
is passed
an
application
layer
message
determines
segment
header
fields
values
creates
segment
passes segment to IP
r
e
c
e
i
v
e
s
2/
44
, CSCI 4500: Chapter 3: Transport Layer | Summaries
extracts application-layer message
demultiplexes message up to application via socke
8. TCP(Transmis- reliable in-order delivery
sion Control congestion control
Protocol) flow control
connection setup
9. UDP (User Data- A no-frills, lightweight transport protocol,
gram Protocol) providing min- imal services, DNS uses this
protocol, connectionless, unreliable, unordered
delivery, best effort(UDP segments may be
lost/delivered out-of-order to app), [RFC768]
10. Services not
pro- vided by delay guarantees
TCP and UDP bandwidth guarantees
11. multiplexing A form of transmission that allows multiple signals
to
travel simultaneously over one medium
12. multiplexing handle data from multiple sockets, add transport
at sender head- er(leaving the center)
13. demultiplexing A process that converts the multiplexed signals to
inde-
pendent signals
14. demultiplexing use header info to deliver received segments to
at receiver correct socket(coming back to center)
15. multiplexing multiplexing — receiver side(happens at
vs transmitter side) demultiplexing — transmitter
demultiplexing side(happens at receiver side)
3/
44
, CSCI 4500: Chapter 3: Transport Layer | Summaries
4/
44
