Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
Leased line |
A serial communications circuit between two points, provided by some service provider, typically a telephone company (telco). Because the telco does not sell a physical cablebetween the two endpoints, instead charging a monthly fee for the ability to send bits between the two sites, the service is considered to be a leased service. |
|
|
Wide-area network (WAN) |
A part of a larger network that implements mostly OSI Layer 1 and2 technology, connects sites that typically sit far apart, and uses a business model in which a consumer(individual or business) must lease the WAN from a service provider (often a telco) |
|
|
Telco |
A common abbreviation for telephone company |
|
|
Serial interface |
A type of interface on a router, used to connect to some types of WAN links, particularly leased lines and Frame Relay access links |
|
|
HDLC |
High-Level Data Link Control. A bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO). |
|
|
DSL |
Digital subscriber line. Public network technology that delivers high bandwidth over conventionaltelco local-loop copper wiring at limited distances. Typically used as an Internet access technology, connecting a user to an ISP |
|
|
Cable internet |
An Internet access technology that uses a cable TV (CATV) cable, normally used for video, to send and receive data |
|
|
Ethernet over MPLS |
A term referring specifically to how a service provider can create Ethernet WAN service using an MPLS network. More generally, a term referring to Ethernet WAN services. |
|
|
1. In the cabling for a leased line, which of the following typically connects to a four-wire line provided by a telco? a. Router serial interface without internal CSU/DSU b. CSU/DSU c. Router serial interface with internal transceiver d. Switch serial interface |
B |
|
|
2. Which of the following is an accurate speed at which a leased line can operate in the United States? a. 100 Mbps b. 100 Kbps c. 256 Kbps d. 6.4 Mbps |
C |
|
|
3. Which of the following fields in the HDLC header used by Cisco routers does Cisco add, beyond the ISO standard HDLC? a. Flag b. Type c. Address d. FCS |
B |
|
|
4. Two routers, R1 and R2, connect using an Ethernet over MPLS service. The service provides point-to-point service between these two routers only, as a Layer 2 Ethernet service. Which of the following are the most likely to be true about this WAN? (Choose two answers.) a. R1 will connect to a physical Ethernet link, with the other end of the cable connected to R2. b. R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service provider point of presence. c. R1 will forward data-link frames to R2 using an HDLC header/trailer. d. R1 will forward data-link frames to R2 using an Ethernet header/trailer. |
B and D |
|
|
5. Which of the following Internet access technologies, used to connect a site to an ISP, offers asymmetric speeds? (Choose two answers.) a. Leased lines b. DSL c. Cable Internet d. BGP |
B and C |
|
|
6. Fred has just added DSL service at his home, with a separate DSL modem and consumer-grade router with four Ethernet ports. Fred wants to use the same old phone he was using before the installation of DSL. Which is most likely true about the phone cabling and phone used with his new DSL installation? a. He uses the old phone, cabled to one of the router/switch device’s Ethernet ports. b. He uses the old phone, cabled to the DSL modem’s ports. c. He uses the old phone, cabled to an existing telephone port and not to any new device. d. The old phone must be replaced with a digital phone. |
C |
