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Networking EXAM 2 Questions with Correct Answers
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Networking EXAM 2 Questions with Correct Answers
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Networking EXAM 2 Questions withCorrect Answers
Application - Answer-supporting network applications
-FTP, SMTP, HTTP
Transport - Answer-process-process data transfer
-TCP, UDP
Network - Answer-routing of datagrams from source to destination
-IP, routing protocols
Data link - Answer-data transfer between neighboring network elements
-Ethernet, 802.111(Wifi), PPP
Physical - Answer-bits "on the wire"
Data Link Layer - Answer-2-physically connected devices:
host-router
router-router
host-host
Unit of Data: *frame*
*responsibility of transferring datagram from 1-node to physically adjacent node over a
link*
Nodes
(Data link layer) - Answer-hosts & routers
Links
(Data link layer) - Answer-communication channels that connect adjacent nodes along
communication path
wired links
wireless links
LANs
Frame , Encapsulates datagram
(data link layer) - Answer-layer-2 packet
, Circuit Switching - Answer-communication mechanism that establishes a *path* b/t
sender & receiver
with guaranteed *isolation* from paths used by other pairs of senders & receivers
associated with telephone technology (provides *dedicated* connection b/t 2-
telephones)
use electronic devices to establish circuits
multiple circuits are multiplexed over shared media
result known as *virtual circuit*
*network that provides a direct connection between each pair of communicating entities*
*3-general properties* define a circuit switched paradigm - Answer-1. Point-to-point
communication
2. Separate steps for circuit creation, use, and termination
3. Performance equivalent to an isolated physical path
Point-to-point communication - Answer-circuit is formed between exactly 2-endpoints
Separate steps for circuit creation, use, and termination - Answer-distinguishes circuits
that are *switched* (i.e., established when needed) from
circuits that are *permanent*
Performance equivalent to an isolated physical path - Answer-communication between
2-parties is *not affected* in any way by communication among other parties
circuit switching must provide *illusion* of an isolated path for each pair of
communicating entities
Switched circuits use a three-step process analogous to placing a phone call - Answer-
1. Circuit is established between 2-parties
2. The 2-parties use the circuit to communicate
3. The 2-parties terminate use
Packet Switching - Answer-use statistical multiplexing (multiple sources *compete* for
the use of shared media
requires sender to divide each message into *blocks* of data known as *packets*
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