I

• + ICMP messages (0)
• + Internet Protocol (2)

N

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

R

• + Routing (3)

R cont.

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

A

• Address Resolution Protocol

C

• CLNS
• CONS

D

• Datagram Delivery Protocol

G

• Grapple (network layer)

H

• Header checksum

I

• IPsec

I cont.

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

M

• MacIP
• Multicast Listener Discovery

N

• Network Control Protocol

N cont.

• Network layer

P

• Packet-Layer Protocol

R

• Resource reservation protocol
• Reverse Address Resolution Protocol

X

• X.121
• X.25