11 - Transport Layer Flashcards Preview

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Flashcards in 11 - Transport Layer Deck (15):
1

What is the transport layer responsible for?

Process to process delivery.

2

Which layer holds port numbers?

Transport layer.

3

Which layer holds IP addresses?

Network layer.

4

What is unique about UDP? Why is it unreliable?

- Provides process-to-process communication instead of host-to-host communication
- No error or flow control

5

What are UDP data units called?

User datagrams.

6

How do you calculate a UDP length?

IP length - IP header's length

7

Describe the what happens with sequence numbers in a SYN segment?

- Cannot carry data
- Consumes one sequence number

8

Describe the what happens with sequence numbers in a SYN+ACK segment?

- Cannot carry data
- Consumes one sequence number

9

Describe the what happens with sequence numbers in a ACK segment?

Consumes NO sequence number if carrying no data

10

Describe the what happens with sequence numbers in a FIN segment?

Consumes ONE sequence number if carrying no data

11

Describe the what happens with sequence numbers in a FIN+ACK segment?

Consumes one sequence number if carrying no data

12

What happens in the slow-start algorithm?

Size of congestion window increases exponentially until it reaches a threshold.

13

What happens in the congestion avoidance algorithm?

Size of congestion window increases additively until congestion is detected.

14

What determines the congestion window (cwnd) value?

The network

15

How is window size determined?

The minimum value between rwnd, cwnd.