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Chapter one networking powerpoints/ other sources
a fresh start from the last set using powerpoints too
Terms in this set (34)
What is another word for transmission rate?
what do packet switches do?
forward chunks of data
what are two types of packet switches?
routers and switches
Store-and-forward transmission provides aid in which of the following switching approach?
A. Circuit switching
B. Packet Switching
C. Both (a) and (b) are correct
D. Neither of the options is corre
B. Packet Switching
* taken from the quiz itself
What do protocols do?
control sending, and receiving of messages
RFC: request for comments
IETF: internet engineering task force
are two examples of
What makes up a network edge?
Hosts: Clients and servers
what is a network core?
What is Fdm, what does it stand for?
frequency division multiplexing
different channels are transmitted in different frequency bands, the bandwitch is shared unlike tdm.
what does hfc stand for
hybrid fiber coax
*since both fiber and coax are used. they are usually employed for cable internet access.
where are enterprise networks typically used ?
companies and universities
how is packet transmission delay calculated?
In other words time needed to transmit L-bit packet into link.
L(bits)/ R (bits/ per seconds)
*Host takes application message and breaks it into smaller chunks known as packets of length L bits.
Then rtansmists packet into acces network at transmission rate R.
What is a physical link?
what lies between transmitter and receiver
what is guided media?
signals propogate in solid media: copper, fiber, coax.
what is unguided media?
signal propogate freely
what is a fiber optic cable?
glass fiber carrying light pulses each pulse a bit.
high speed operation
low error rate
immune to electromagnetic noise
what are some radio link types?
what are communication links made up of ?
physical media pg 4
How is the transmission rate of a link measured?
bits per second
An entire packet must arrive at the router before it can be transmitted on next link true or false
what happens when the arrival rate ( in bits) to link exceeds transmission rate of link for a period of time?
Packets will queue, or wait to be transmitted on link
packets can be dropped or lost if memory (buffer) fills up.
What are the two key network core functions?
Routing and forwarding
what is the job of the router and forwarder?
routing determines source destination route taken by packets
forwarding moves packets from routers input to appropriate router output
explain circuit switching
the resources needed to provide for communication are reserved for the duration of the communication session between the end systems.
*think of telephones andy griffith show the operator had to connect you to that reserved line.
packet switched networks typically handle digital data and circuit switched networks typically handle telephone calls. true or false
what is voip?
telephone service over the internet
explain packet switching
hosts break application layer messages into packets.
they forward packets from one router to the next across links on path from source to destination. each packet is transmitted at full link capacity.
how does packet loss and delay happen?
packets quue in router buffers,
packet arrival rate to link exceeds output link capacity
then packerts queue and wait for their turn
what is the order of the internet protocol stack, aka the layers.
1) top layer: applicaiton
2)second layer: Transport
3) third layer : Network
5) last layer: physical
what does each internet protocol layer do?
application layer: supports network applications such as http ftp smtp
transport layer: process- process data transfer tcp and udp
network layer: routing of datagrams from source to destination
ip, routing protocols
link layer: data transfer between neighboring network elements ethernet, wifi
physical: bits on the wire
how is propogation delay measured?
the distance between routers divided by propogation speed.
what is the processing delay
the time required to examine the packets header and determine where to direct the packet.
difference between transmission delay and propogation delay
transmission delay is the amount of time required for the router to push out the packet, it is a function of the packets length and the transmission rate of the link, but has nothing to do with the distance between the two routers.
propogation delay is the time it takes a bit to propogate from one router to the next, it is a function of the distance between the two routers but has nothing to do with the packets length or transmission rate of the link.
explain the different layers
Application : where network applications and their application layer protocols reside.
Transport: transports application layer messages between application endpoints.
Network: responsible for moving network layer packets known as datagrams from one host to another.
Link: moves packets from one node ( host or router) to the next node in thr route.
physical: move individual bits within the frame from one node to another.
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