-
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.
Repeater
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________ 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
Bridges
-
_____ 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
Routers
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_____ 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.
Switches
-
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.
gateway
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______ 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
WAN switches
-
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
multiplexer
-
An ____ _______acts as a concentration point and provides dial-in and dial-out connection from the internal network
access server
-
______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
modems
-
____ _______ _____ 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
technology.
-
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
area.
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
physical connections.
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.
Options:
1. ATM
2. HDLC
3. SDLC
4. SMDS
Targets:
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.
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