A wide area network (WAN) is a data network that connects local area networks (LANs) across long distances. WANs can be used to connect LANs in different cities, countries, or even continents.
WAN Technologies
There are a variety of WAN technologies available, including:
- Leased lines: Leased lines are dedicated data circuits that are leased from a telecommunications provider. Leased lines are typically the most expensive WAN technology, but they also offer the highest performance and reliability.
- Frame Relay: Frame Relay is a packet-switching WAN technology that is widely used by businesses. Frame Relay is less expensive than leased lines, but it also offers lower performance and reliability.
- MPLS: Multiprotocol Label Switching (MPLS) is a packet-switching WAN technology that offers high performance and reliability. MPLS is often used by businesses to connect their headquarters to their branch offices.
- DSL: Digital Subscriber Line (DSL) is a broadband technology that uses existing telephone lines to deliver high-speed internet access. DSL is a popular choice for small businesses and home users.
- Cable: Cable internet is a broadband technology that uses existing cable television lines to deliver high-speed internet access. Cable internet is another popular choice for small businesses and home users.
- Satellite internet: Satellite internet is a broadband technology that uses satellites to deliver high-speed internet access. Satellite internet is a good choice for businesses and homes in remote areas where other WAN technologies are not available.
WAN Design
When designing a WAN, it is important to consider the following factors:
- Performance: What level of performance is required for the WAN?
- Reliability: What level of reliability is required for the WAN?
- Cost: What is the budget for the WAN?
- Security: What security requirements must the WAN meet?
WAN Management
WANs need to be managed and monitored to ensure that they are performing as expected. WAN management tasks include:
- Configuration: Configuring the WAN devices, such as routers and switches.
- Monitoring: Monitoring the performance and reliability of the WAN.
- Troubleshooting: Troubleshooting any problems that occur on the WAN.
MCQs and Answers
- Which of the following is a WAN technology?
- (a) Leased line
- (b) Frame Relay
- (c) MPLS
- (d) All of the above Answer: (d) All of the above
- Which of the following WAN technologies is the most expensive?
- (a) Leased line
- (b) Frame Relay
- (c) MPLS
- (d) DSL Answer: (a) Leased line
- Which of the following WAN technologies is often used by businesses to connect their headquarters to their branch offices?
- (a) Leased line
- (b) Frame Relay
- (c) MPLS
- (d) All of the above Answer: (c) MPLS
- Which of the following WAN technologies is a good choice for businesses and homes in remote areas?
- (a) DSL
- (b) Cable
- (c) Satellite internet
- (d) All of the above Answer: (c) Satellite internet
- Which of the following WAN management tasks involves configuring the WAN devices?
- (a) Configuration
- (b) Monitoring
- (c) Troubleshooting
- (d) None of the above Answer: (a) Configuration
Conclusion
WAN technologies allow businesses and individuals to connect to the internet and to each other over long distances. There are a variety of WAN technologies available, each with its own advantages and disadvantages. When choosing a WAN technology, it is important to consider the specific needs of the business or individual.