Shared Flashcard Set

Details

V-3 Sec. 1
5Level
24
Computer Science
Professional
10/15/2008

Additional Computer Science Flashcards

 


 

Cards

Term
Transceivers are capable of operating in what modes?
Definition

Transceivers are capable of operating in full duplex, half duplex, and simplex mode.

Term
What device can be viewed as teh actual interface between workstations, servers, clients, and the shared media of the network?
Definition
The NIC.
Term
Nearly all NIC's contain what device that transmits and receives data signals?
Definition
A data transceiver.
Term
What is one way repeaters overcome attentuation?
Definition

Repeaters remove the unwanted noise in an incoming signal.

Term
What do all devices on a network share when connected to a hub?
Definition

They share the same amount of bandwidth and the same collision domain.

Term
What are the three classifications for hubs?
Definition

(1) Passive.

(2) Active.

(3) Intelligent.

Term
What are some advantages of switches?
Definition

(1) Switches have internal processor,operating system, memory, and several ports that enable other nodes to connect to it.

(2) Switches have multiple ports and can make better use of limited bandwidth and prove more cost-efficient than bridges.

(3) Each port acts like a bridge, and each device connected to a switch effectively receives its own dedicated channel.

(4) A switch limits the number of devices in a collision domain and limits the potential for collisions.

Term
What are some disadvantages of switches?
Definition

Although they contain buffers to hold incoming data and accomodate bursts of traffic, they can become overwhelmed by continous, heavy traffic. In that event, the switch cannot prevent data loss.

Term
Why would you replace a backbone router with a switch?
Definition

Because a switch provides at least two advantages: Better Security and Better Performance.

Term
Where can a Gateway reside?
Definition

Gateways can reside on servers, microcomputers, connectivity devices (such as routers), or mainframes.

Term
What are some popular types of gateways?
Definition

Popular types of gateways include e-mail gateway, IBM host gateway, internet gateway, LAN gateway, vioce/data gateway, and firewall.

Term
Routers operate at what layer of the OSI model?
Definition

Routers operate at the Network layer (Layer 3) of the OSI model.

Term
What does a typical router contain?
Definition

A typical router has an internal processor, an operating system, memory, input and output jacks for different types of network connectors (depending on the network type), and, usually, a management console interface.

Term
What tasks can all routers do?
Definition

Too long for flash card-refer to page 1-16

Term
Identify and define the four common routing protocols.
Definition

(1) RIP-Oldest, used for interior or border routers. Does not work well in very large network environments. Slow and less secure.

(2) OSPF-Use on interior/border routers. Uses more complex algorithm for best paths. Supports many routers and manufacturers

(3) EIGRP-Interior/Border routers. Developed in mid-1980s by Cisco. Only works w/ Cisco. More efficient.

(4) BGP-Used on border and exterior routers.

Term
What is a brouter?
Definition
As their name suggests, these devices are a cross or hybrid between bridges and routers.
Term
What are the four types of switching devices?
Definition

(1) Cut-through.

(2) Store and forward.

(3) Hybrid.

(4) Fragment-free.

Term
Hybrid switches represent a combination of what switching devices?
Definition
Cut-through and store and forward switches.
Term
What is the advantage of a hybrid switch?
Definition

Its minimal latency when error rates are low and it becomes a store and forward when error rates rise, allowing it to discard frames when error rates get high.

Term
SONET can serve what purpose?
Definition

SONET serves as very high-speed backbones in the Internet, as high-speed distribution networks in local exchange and interoffice facilities, and provide optical transport channels for private connections.

Term
A SONET network may contain what equipment?
Definition
ADM, TM, DCS, DLC, MN, and D+R.
Term
What do SONET standards define?
Definition

A set of optical/electronic interfaces for network transport.

Term
What is ATM?
Definition

ATM is an ITU networking standard describing Data Link layer protocols for both network access and signal multiplexing.

Term
Because ATM packages data into cells before transmission it is considered what type of technology?
Definition
ATM is typically considered a packet-switching technology.
Supporting users have an ad free experience!