IP: Internet Protocol Flashcards
What path are two consecutive IP datagrams guaranteed to take?
None, IP is a connectionless protocol.
What happens when something goes wrong delivering a Datagram? (Such as a router with a full buffer)
The Datagram is dropped and a ICMP message is send to the source address.
What byte ordering is required of all data in an IP header?
Big-Endian.
What is in the header length field of a 20 byte IP header?
- Header length is the number of 32-bit words in a header.
How large is the header length field in an IP header and what limitations does that put on the size of the header?
4 bits. Which limits the header size to 60 bytes.
What does TOS stand for in an IP header?
Type of service.
How large is the TOS field in an IP header and how is it laid out at the bit level?
8 bits. 3-bit precedence field (now ignored), 4-bit TOS, 1-bit trailer that must be set to zero.
What types of service can be specified in the TOS field in the IP header?
Minimize delay, maximize throughput, maximize reliability, minimize monetary cost.
How many of the TOS bits in the IP header can be set at one time?
1
If none of the bits in the TOS field of the IP header are set, what type of service does that signify?
Normal service.
What does the total length field in an IP header represent?
The total size of the datagram in bytes.
How large is the total length field in an IP header and what is the size limitation that imposes?
Total length field is 16-bits which limits the total datagram size to 65535 bytes (64k).
What does Ethernet do to an IP datagram that is less than 46 bytes in length?
Adds padding of zeroes until the minimum length (46 bytes) is reached.
What does the identification field in an IP header do?
Uniquely identifies each datagram sent by a host.
What is the maximum size of an IP datagram that a host is required to receive?
576 bytes
