Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

127 notes > lecture 2 > Flashcards

lecture 2 Flashcards

1
Q

3 kinds of data flow

A
  1. simplex
  2. half duplex
  3. full duplex
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

describe a simplex data flow

A
  • one way flow

- A sends to B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

describe a half duplex data flow

A
  • two way flow
  • one at a time
  • A sends to B
  • B sends to A
    e. g fibre optics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

describe a full duplex data flow

A
  • A and B can send to each other simultaneously
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is a subnet

A

everything between the hosts

e.g the routers,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is a host or end-system

A
  • a computer that a user logs into to do work

- attached to network, not part of network (usually)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

3 ways to classify networks

A
  • transmission technology
  • size
  • topology
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

3 kinds of transmission technology

A
  1. broadcast
  2. multicast
  3. unicast (p2p)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

describe broadcast transmission

A
  • one to all
  • in bus topology everybody receives it but ignore it and only destined receiver will respond
  • a 0 bit is broadcast
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

describe multicast transmission

A
  • communication with specified groups
  • a 1 bit is multicast
  • uses a GID (group ID)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

describe unicast transmission
(p2p, end to end, host to host)
(3)

A
  • links between nodes
  • from source to destination: visit one or more nodes
  • uses protocols to optimize routing (find best path)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

large networks tend to use what kind of transmission technology and why?

A
  • UNICAST (P2P)
    e.g internet, sending an email
    why?
  • decrease collisions and traffic
  • increase efficiency
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

where do routing algorithms play an important role (broadcasting, multicasting, P2P)?

A

UNICAST (P2P)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

4 types of network structures

A
  • LAN (10m to 1Km)
  • MAN (10km, city)
  • WAN (100km - countries, continents, planets)
  • Wireless
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

why do we need to classify network structures, what changes?

A
  • protocols used
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

LANs (6)

A
  • used in small geographic regions
  • high data rates (min: 10-100Mbps ++)
  • low cost
  • typically use BROADCAST transmission technology
  • can be used a testing environment for other protocols
  • IEEE 802.3
17
Q

in LAN bus topology, what protocol do we use to transmit

A

CSMA

- to make sure corresponding node is not broadcasting, otherwise collision happens

18
Q

ad hoc network (4)

A
  • no router
  • connecting devices directly
  • similar to hotspot/bluetooth
  • IoT uses this tech
19
Q

MANs (4)

A
  • used in medium size geographic regions
  • does not use switching elements, single wires instead
  • e.g. is cable TV
  • IEEE 802.6 (DQDB)
  • slower than a LAN (bigger)
20
Q

what is dual queue dual bus?

A
  • used in MANs

- uses two unidirectional broadcast buses with different directions

21
Q

WANS (4)

A
  • used in large geographic regions
  • low data rates (hella big)
  • high cost
  • uses transmission lines and switches, routers and hubs
  • e.g. Internet
22
Q

examples of wireless networks

A
  • bluetooth

- flying LAN in airplanes

23
Q

6 types of topologies

A
  • bus
  • ring
  • tree
  • star
  • mesh
  • hybrid
24
Q

if we have bidirectional bus flow

A
  • use baseband cable and repeater
25
Q

bus pros (2) and cons (3)

A

pros
- Requires less cable length this less cost
- Easy to set up for small networks
cons
- Adding nodes/devices can slow the network (high traffic)
- Troubleshooting is not easy because all devices are connected to a central cable
- If central cable (bus) fails, then the network fails

26
Q

how can we fix a unidirectional ring

A
  • add an extra ring to make it bidirectional
27
Q

best case and worst case in uni ring

A 
best= A to B
1 links/hop
worst= A to last one
n - 1 links/hops
n = number of nodes
28
Q

best, average, worst case in bi ring

A

best: 1
average= n+2/4
worst= n/2

29
Q

what network structure uses tree topology

A

MANs

30
Q

star pros and cons

A

Pros:
- Easy to troubleshoot
- Devices can be easily added/removed without affecting overall connectivity and performance
Cons:
- If the central hub fails, then the whole network is disrupted (it is centralized)
- Devices can only be added depending on the number of outlets present in the hub

31
Q

bi star pros (3) and cons (2)

A

Pros:
- Can provide an alternative path in the case of failure of 1 node
- Minimal packet collisions
- High speed of data transfer
Cons:
- Addition/removal of nodes is difficult
- Failure of two adjacent nodes can disrupt the network

32
Q

uni star pros (1) and cons (2)

A

Pros:
- Less packet collisions
Cons:
- If one node fails, the whole network is disrupted since data packets can only be moved in one direction
- Adding/removing nodes without interfering with the network is difficult

33
Q

what topologies use broadcast

A
  • bus

- ring

34
Q

mesh pros and cons

A

Pros
- Many alternative paths
Cons:
- Hella costly to make and add (NOT SCALABLE)

35
Q

types of connections

A
  • P2P: station to station

- Multipoint: mainframe to many stations

36
Q

switched WAN vs p2p WAN

A
  • switched: going through multiple WAN networks before reaching destination
  • p2p
37
Q

best, average, worst case in star

A 
best= 2
average= n+2/4
worst= 2
38
Q

best, average, worst case in mesh

A 
best= 1
average= 1
worst= 1

127 notes (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions