CCNP Enterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco Enterprise Networks

Appendix D. Memory Tables

Chapter 1

Table 1-2 IP Protocol Numbers

Protocol Number	IP Protocol
1	Internet Control Message Protocol (ICMP)
2	Internet Group Management Protocol (IGMP)
6
	User Datagram Protocol (UDP)
	IPv6 encapsulation
50
51
	ICMPv6
89	Open Shortest Path First (OSPF)
103
	Virtual Router Redundancy Protocol (VRRP)

Table 1-3 IPv4 Header Fields

Field	Length	Description
	4 bits	Indicates the IP header’s format, based on the version number. Set to 0100 for IPv4.
IHL
		QoS parameters.
Total Length		Length of the packet, in bytes, including header and data.
Identification	16 bits	Identifies a fragment.
	3 bits
Fragment Offset	13 bits
	8 bits	Decremented ...