1. What are the two most commonly referenced fields in an IPv4 packet header that indicate where the packet is coming from and where it is going? (Choose two.)
- destination IP address
- protocol
- Time to Live
- source IP address
- Differentiated Services (DS)
Explanation: The IP header fields that identify where the packet originated and where it is going are Source IP Address and Destination IP Address.
2. Which statement is correct about IPv4 packet header fields?
- The source and destination IPv4 addresses remain the same while travelling from source to destination.
- The Time to Live field is used to determine the priority of each packet.
- The Total Length and Header Checksum fields are used to reorder a fragmented packet.
- The Version field identifies the next level protocol.
Explanation: The source and destination IP addresses in the IP packet do not change in route from source to destination.
3. Which field is used to detect corruption in the IPv4 header?
- Header Checksum
- Time to Live
- Protocol
- Differentiated Services (DS)
Explanation: The Header Checksum field in an IPv4 header is used to detect corrupt packets.
4. Which field includes common values such as ICMP (1), TCP (6), and UDP (17)?
- Header Checksum
- Time to Live
- Protocol
- Differentiated Services (DS)
Explanation: The protocol field identifies the upper layer protocol that is carried inside the IP packet. Common protocols are TCP, UDP, and ICMP.