I

• + ICMP messages (0)
• + Internet Protocol (3)

N

• + Network Address Translation (1)
• + Network addressing (3)

R

• + Routing (4)

R cont.

• + Routing algorithms (0)
• + Routing protocols (2)

C

• CLNS
• CONS

D

• Datagram Delivery Protocol

G

• Grapple (network layer)

H

• Header checksum

I

• ICMPv6
• IPsec

I cont.

• IPv4
• IPv6
• Internet Control Message Protocol
• Internet Group Management Protocol
• Internet Layer
• Internetwork Packet Exchange

M

• MacIP
• Multicast Listener Discovery

N

• Network Control Protocol
• Network Layer

P

• Packet-Layer Protocol

R

• Resource reservation protocol

X

• X.121
• X.25