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A _________ is the simplest device for connectivity. It enables a network to extend by repeating
and amplifying electric signals between different cable lengths. _____ work at the physical layer in the OSI model.
________ are used to connect different LAN segments. They work at the data link layer of the OSI
model. A _______ verifies the media access control (MAC) address of an approaching signal to
confirm whether the destination computer is on that specific network segment
_____ function at the network layer of an OSI model. These are used to connect different
networks. A _____ can look at the destination IP address of a data packet and use a routing
table to forward it to the appropriate destination
_____ are similar to bridges in their function. They operate at the data link layer and forward
data packets based on the MAC address. Unlike a bridge, a ____ uses hardware in the form of
a circuit to ____ data directly to the destination computer or network.
A _______ functions at the application layer of the OSI model and, therefore, performs much more complex tasks than a router or a bridge. Routers are used to connect two different environments or topologies.
______ are multiport networking devices that are used to connect private data over public
data circuits. These ___function at the data link layer of the OSI model
A _______is used to send several transmission streams simultaneously, over one physical circuit. It is also used to split a received stream into component parts
An ____ _______acts as a concentration point and provides dial-in and dial-out connection from the internal network
______s enable transmission of data over voice grade telephone lines by translating analog signals into digital form and converting it back into a digital signal at the destination point
____ _______ _____ are used to connect a LAN to a WAN. A CSU provides a digital interface to data terminal equipment (DTE) and a physical interface to the data circuit-terminating equipment (DCE) device.
Channel service units (CSUs)
These are the various technologies used by WANs
- • Switching
- • ATM
- • SMDS
- • SDLC
- • HDLC
Similar to LAN protocols, WAN protocols have also been formulated to regulate communication
between large and diverse networks. These protocols are designed to run on a specific WAN
In a circuit switching technology, a virtual connection is set up between two devices on a WAN.
- This connection acts like a dedicated link between the sender and the receiver devices. This
- circuit is torn down when the session ends. Telephone systems function using this technology.
- A packet switching technology breaks the data into packets that can pass through a number of
- different devices before reaching the destination. These data packets can follow multiple paths to
- reach to the same destination. The Internet is an example of packet switching technology.
_____ is a high speed networking technology used in LANs and
WANs. It is a connection-oriented switching technology that uses a cell-switching method.
In ____, data is broken into fixed size cells of 53 bytes. To send these data cells, ____ creates a dedicated path between the source and the destination by setting up virtual circuits.
Asynchronous transfer mode (ATM)
______ ______ ______ ______ is used for communication over public data
networks. It is a connectionless, high speed, packet switched, datagram-based WAN technology.
It can be used to extend the communication capabilities of a network over a wide geographical
Switched multimegabit data service (SMDS)
______ ___ ____ _____ is a bit-oriented synchronous protocol that was originally
developed by IBM. It is used in networks with dedicated leased lines and having permanent
Synchronous data link control (SDLC)
____ ____ ____ ____ is a bit-oriented data link protocol. It was developed by
International Organization for Standardization (ISO) and can provide both connectionless and
connection oriented services
High level data link control (HDLC)
Match each WAN technology to the corresponding description.
A. Breaks data into fixed size cells
B. Can provide both connectionless and connection-oriented services
C. Is a packet switched, datagram-based technology
D. Is used in networks with dedicated leased lines
ATM breaks data into fixed size cells; HDLC provide both connectionless and connectionoriented
services; SMDS is a packet switched, datagram-based technology; and SDLC is used in networks with dedicated leased lines.