Which of the following topologies is used in Wide Area Networks (WANs)?

A.
FDDI

B.
CDDI

C.
SONET

D.
Token Ring

Explanation:
Synchronous Optical NETwork (SONET) is the standard topology for fiber optic networks. Developed in 1980s,
SONET can transmit data at rates of up to 2.5 gigabits per second (Gbps).
All other options are incorrect because they are LAN topologies, not WAN topologies.
Fiber Distributed Data Interface (FDDI) specifies a 100-Mbps dual-ring fiber optics-based token-passing LAN.
FDDI is typically implemented for high-speed LAN backbones because of its support for high bandwidth.
Copper Distributed Data Interface (CDDI) is copper version of FDDI. They differ only in that FDDI can span
longer distances than CDDI due to the attenuation characteristics of copper wiring.
Token Ring/IEEE 802.5 LAN technology was developed by IBM in 1970. Token-ring LAN technology is based
on token-passing, in which a small frame, called a token, is passed around the network. Possession of the
token grants the node the right to transmit data. Once the data is transmitted, the station passes the token to
the next end station.
Objective:
Network Fundamentals
Sub-Objective:
Compare and contrast network topologies

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