Exam 7: WANs and Remote Connectivity

On most modern WANs,a ring topology relies on ____ rings to carry data.

Describe an important difference between frame relay and X.25.

Because WAN connections require routers or other Layer 3 devices to connect locations,their links are not capable of carrying ____ protocols.

A PSTN offers ____ security.

In a star topology,a single connection failure will halt all traffic between all sites.

MATCHING 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 -Occurs when downstream throughput is higher than upstream throughput.

What sets ATM apart from Ethernet is its ____ size.

The individual geographic locations connected by a WAN are known as ____.

In a process called ____,two 64-Kbps ISDN B channels can be combined to achieve an effective throughput of 128 Kbps.

Define a fractional T1 and explain why an organization might implement it.

SONET's extraordinary ____ results from its use of a double-ring topology over fiber-optic cable.

The speed of a T-carrier depends on its ____ level.

____ is an updated,digital version of X.25 that also relies on packet switching.

____________________ encapsulates incoming Ethernet or token ring frames,then converts them into ATM cells for transmission over an ATM network.

____ virtual computing allows a user on one computer,called the client,to control another computer,called the host or server,across a network connection.

Dial-up ISDN does not convert a computer's digital signals to analog before transmitting them over the PSTN.

A ____ aggregates multiple DSL subscriber lines and connects them to the carrier's CO.

MATCHING 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 -Contains a single site acting as the central connection point for several other points.

Explain how a cable modem is utilized in broadband cable connections.

A(n)____________________ uses TDM (time division multiplexing)over two wire to divide a single channel into multiple channels.