Explanation/Reference:
WAN Protocols and Their Corresponding OSI Layers

Microsoft 98-366 : Practice Test

Explanation/Reference:
Incorrect:
The private address space specified in RFC 1918 is defined by the following three address blocks:
not A: 192.168.0.0/16
The 192.168.0.0/16 private network can be interpreted either as a block of 256 class C network IDs or as a 16- bit assignable address space (16 host bits) that can be used for any subnetting scheme within the private organization. The 192.168.0.0/16 private network allows the following range of valid IP addresses: 192.168.0.1 to 192.168.255.254.
Not C:
10.0.0.0/8
The 10.0.0.0/8 private network is a class A network ID that allows the following range of valid IP addresses:
10.0.0.1 to 10.255.255.254. The 10.0.0.0/8 private network has 24 host bits that can be used for any subnetting scheme within the private organization.
Not D:
172.16.0.0/12
The 172.16.0.0/12 private network can be interpreted either as a block of 16 class B network IDs or as a 20-bit assignable address space (20 host bits) that can be used for any subnetting scheme within the private organization. The 172.16.0.0/12 private network allows the following range of valid IP addresses: 172.16.0.1 to
172.31.255.254.
Reference: Technet, Public and Private Addresses