---
title: "cosc203-lab20"
aliases: 
tags: 
- lab
- cosc203
---

![](https://i.imgur.com/EnNd94C.png)

1. header
	1. 4 fields
		1. source port
		2. dest port
		3. length
		4. checksum
	2. each field is 2 bytes
![100](https://i.imgur.com/dzMuJWY.png)

2. payload is 980 bytes
	1. max is 65536-8 = 65528

3. 17 ![50](https://i.imgur.com/uKGY8WP.png)

![](https://i.imgur.com/In1iX3w.png)
4. the source port of the first message is the destination port of the second and the destination port of the first is the destination port of the second
5.