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

Appendix E. Memory Tables Answer Key

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	Transmission Control Protocol (TCP)
17	User Datagram Protocol (UDP)
41	IPv6 encapsulation
50	Encapsulating Security Payload (ESP)
51	Authentication Header (AH)
58	ICMPv6
88	Enhanced Interior Gateway Routing Protocol (EIGRP)
89	Open Shortest Path First (OSPF)
103	Protocol-Independent Multicast (PIM)
112	Virtual Router Redundancy Protocol (VRRP)

Table 1-3 IPv4 Header Fields

Field	Length	Description
Version	4 bits	Indicates the IP header’s format, based on the version number. Set to 0100 for IPv4.
IHL	4 bits