NT1210 Unit 7 Study Guide
NT1210 Unit 7 Student Study Guide
1. What type of service was offered by the first Telcos? O 309
Switched Analog Circuits for Voice
2. Name the two critical components used to implement a switched analog circuit. O 309
Local Loop and Central Office
3. What type of circuit is always on and is not analog? O 312
Lease Line
4. Explain switched and dedicated circuit. O 313-315
Switched circuit is created on demand as needed.
Dedicated Circuit – Constant Circuit between two specific devices.
5. What is the purpose of a router? O 318
Forward Packets at Layer 3
6. At what layer of the OSI model does a router function? O 318
Layer 3
7. What is the process of adding headers and trailers called? O 319-320
Encapsulation
8. Name the three main categories of WAN topologies. O 321-324
Point-to-point, HUB and Spoke/Star, Multipoint
9. Compare a WAN Hub and Spoke to a LAN Star topology. O 323
Type of equipment used
10. What three criteria are considered when implementing a leased line? O 326-328
Distance, availability and cost
11. At what point does the responsibility of a link change from customer to Telco? O 329
At the point of demark, where the wire leaves the house.
12. Explain the T-carrier system and the multiplexing system it uses. O 332-334
Time division multiplexing
13. What are the two main WAN protocols used today? O 345
HDLC, PPP
14. What switching method saves capacity and uses less cable? O 348-349
Packet Switching
15. What was the first popular packet switching WAN protocol and what type of circuits did it use? O 351-354
Frame Relay and it used frame relay circuits
16. What is the key difference between a partial mesh and full mesh topology? O 355
Partial mesh – 3 or more routers are directly connected to each other, not all routers on the network are connected to each other.
Full mesh – All routers are directly connected
1. What type of service was offered by the first Telcos? O 309
Switched Analog Circuits for Voice
2. Name the two critical components used to implement a switched analog circuit. O 309
Local Loop and Central Office
3. What type of circuit is always on and is not analog? O 312
Lease Line
4. Explain switched and dedicated circuit. O 313-315
Switched circuit is created on demand as needed.
Dedicated Circuit – Constant Circuit between two specific devices.
5. What is the purpose of a router? O 318
Forward Packets at Layer 3
6. At what layer of the OSI model does a router function? O 318
Layer 3
7. What is the process of adding headers and trailers called? O 319-320
Encapsulation
8. Name the three main categories of WAN topologies. O 321-324
Point-to-point, HUB and Spoke/Star, Multipoint
9. Compare a WAN Hub and Spoke to a LAN Star topology. O 323
Type of equipment used
10. What three criteria are considered when implementing a leased line? O 326-328
Distance, availability and cost
11. At what point does the responsibility of a link change from customer to Telco? O 329
At the point of demark, where the wire leaves the house.
12. Explain the T-carrier system and the multiplexing system it uses. O 332-334
Time division multiplexing
13. What are the two main WAN protocols used today? O 345
HDLC, PPP
14. What switching method saves capacity and uses less cable? O 348-349
Packet Switching
15. What was the first popular packet switching WAN protocol and what type of circuits did it use? O 351-354
Frame Relay and it used frame relay circuits
16. What is the key difference between a partial mesh and full mesh topology? O 355
Partial mesh – 3 or more routers are directly connected to each other, not all routers on the network are connected to each other.
Full mesh – All routers are directly connected