Chapter 1: IP and L3 Tech Flashcards
1
Q
How large is the IP Header of an IP Packet?
A
- between 20 and 60 bytes
2
Q
What fields are in an IP Header?
A
- Version
- Internet Header Length
- Notification and Explicit Congestion
- Total Length
- Identification
- Flags and Fragment Offset
- Time to Live
- Protocol
3
Q
What does an IP Packet that is only 20 bytes long contain?
A
- Just the IP Packet Header
4
Q
What is the largest IP Packet that Ethernet can transport?
A
- 1500 bytes
5
Q
What is the Identification field used for?
A
- used when an IP packet needs to be fragmented due to constraint of Layer 2 (Ethernet) Packet size limits
6
Q
Which IP Header field provides Quality of Service?
A
- Notification and Explicit Congestion
7
Q
What does the TTL field do?
A
- prevents IP packets from looping indefinitely
When the TTL goes to zero, the router discards the packet and sends a message to the sender to tell it that the packet was dropped