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Chapter 7

Chapter 7 Study Guide

Network Fundamentals Chapter 7

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____ 1. WANs typically send data over ____ available communications networks.
a. privately c. individually
b. publicly d. serially

____ 2. The individual geographic locations connected by a WAN are known as ____.
a. WAN sites c. network service providers
b. WAN links d. central offices

____ 3. Because WAN connections require routers or other Layer 3 devices to connect locations, their links are not capable of carrying ____ protocols.
a. open c. routable
b. standard d. nonroutable

____ 4. On most modern WANs, a ring topology relies on ____ rings to carry data.
a. flexible c. serial
b. open d. redundant

____ 5. The portion of the PSTN that connects any residence or business to the nearest CO is known as the ____.
a. demarcation point c. local loop
b. NIU (Network Interface Unit) d. central office

____ 6. A PSTN offers ____ security.
a. exceptional c. expanded
b. marginal d. dedicated

____ 7. ____ is an updated, digital version of X.25 that also relies on packet switching.
a. DSL c. Frame relay
b. ISDN d. ATM

____ 8. In a process called ____, two 64-Kbps ISDN B channels can be combined to achieve an effective throughput of 128 Kbps.
a. slicing c. merging
b. linking d. bonding

____ 9. A ____ converts digital signals into analog signals for use with ISDN phones and other analog devices.
a. terminal adapter c. smart jack
b. DSLAM d. terminator

____ 10. ISDN PRI uses ____ B channels and one 64-Kbps D channel.
a. 10 c. 23
b. 12 d. 32

____ 11. The speed of a T-carrier depends on its ____ level.
a. signal c. channel
b. hierarchy d. traffic

____ 12. At the customer’s demarcation point, either inside or outside the building, T-carrier wire pairs terminate with a ____.
a. terminal adapter c. CSU/DSU
b. smart jack d. switch

____ 13. A ____ aggregates multiple DSL subscriber lines and connects them to the carrier’s CO.
a. terminal adapter c. smart jack
b. DSLAM d. terminator

____ 14. Broadband cable requires many subscribers to share the same local line, thus raising concerns about ____ and actual (versus theoretical) throughput.
a. access c. noise
b. costs d. security

____ 15. What sets ATM apart from Ethernet is its ____ size.
a. channel c. variable packet
b. frame d. fixed packet

____ 16. SONET’s extraordinary ____ results from its use of a double-ring topology over fiber-optic cable.
a. throughput c. fault tolerance
b. low cost d. latency

____ 17. The data rate of a particular SONET ring is indicated by its ____, a rating that is internationally recognized by networking professionals and standards organizations.
a. OC (Optical Carrier) level c. BRI (Basic Rate Interface)
b. CIR (committed information rate) d. DS0 (digital signal, level 0)

____ 18. ____ networking refers to dialing directly into a private network’s or ISP’s remote access server to log on to a network.
a. Remote c. Dial-up
b. Direct d. Virtual

____ 19. ____ is the preferred communications protocol for remote access communications.
a. SLIP c. PPP
b. IP d. TCP/IP

____ 20. ____ is the standard for connecting home computers to an ISP via DSL or broadband cable.
a. SLIP c. PPP
b. SLIPoE d. PPPoE

____ 21. ____ virtual computing allows a user on one computer, called the client, to control another computer, called the host or server, across a network connection.
a. Random c. Open
b. Network d. Remote


Match each item with a statement below:
a. bus topology WAN f. upstream
b. star topology WAN g. asymmetrical communications
c. mesh topology WAN h. symmetrical technology
d. tiered topology WAN i. signal level
e. downstream

____ 22. Contain sites that are connected in star or ring formations are interconnected at different levels, with the interconnection points being organized into layers to form hierarchical groupings.

____ 23. Occurs when data travels from the carrier’s switching facility to the customer.

____ 24. Contains a single site acting as the central connection point for several other points.

____ 25. Occurs when downstream throughput is higher than upstream throughput.

____ 26. Refers to the T-carrier’s Physical layer electrical signaling characteristics as defined by ANSI standards in the early 1980s.

____ 27. Occurs when data travels from the customer to the carrier’s switching facility.

____ 28. Occurs when each site is directly connected to no more than two other sites in a serial fashion.

____ 29. Provides equal capacity for data traveling both upstream and downstream.

____ 30. Incorporates many directly interconnected sites.