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1

what is OSI?

what are the 7 layers?

1-7

open standards interconnection

application
presentation
session
transport
network
data
physical

2

what is the job of the physical layer?

1-7

defines electrical, mechanical, and procedural aspects of communication

3

what is the job of the data link layer?

what about its 2 sublayers?

1-7

defines how we put data on the wire

2.1 - logical link control provides general path to present the communication to the next layer of the model

2.2 - media access control examines the physical address presented to it and addresses packets that it sends

4

what is the job of the network layer?

what is the primary protocol of the network layer?

1-7

defines the logical addressing of computers and devices on the network

IP - internet protocol

5

what is the job of the transport layer?

1-8

defines the connection methods for communication between two devices

6

what is the job of the session layer?

1-8

establishment, maintenance and termination of computer sessions

7

what are the jobs of the presentation layer?
there are 4 of them

1-8

translation of data sent over the wire

format, encryption, compress (all 3 of these are on the data to be sent)

8

what is the application layer?

what is this layer's most common protocol?

1-8

collection of protocols that the user utilizes to begin to put data into the system and eventually onto the wire

HTTP - hypertext transfer protocol

9

state the 4 layers of the TCP/IP model and pair them against the OSI model

1-8,9

OSI - 7.application, 6.presentation, 5.session, 4.transport, 3.network, 2.data link, 1.physical

TCP/IP - 4.application, 3.transport, 2.internet, 1.network access

10

what is the job of the network access layer of TCP/IP model?

1-8

defines methods of putting data onto the wire and defines what that wire can be

11

what is the job of the internet layer of TCP/IP?

1-9

defines the logical communication links between two or more computers

12

what is the job of the transport layer in TCP/IP? in other words, what are the 2 protocols here?

1-9

TCP - transmission control protocol, guaranteed connection-oriented communication

UDP - user datagram protocol, broadcast best-effort communication

13

what are the jobs of the application layer of TCP/IP model? there are 3 of them

1-9

defines protocols user is using
translation in the network
connection methods for communication

14

what is EUI-64 full name?

what is it replacing?

1-11

extended unique identifier - 64

replacing MAC-48 addresses

15

looking at the OSI model, what are the different packet terms for each layer?

1-12

application - data
presentation - data
session - data
transport - datagram
network - packet
data link - frame
physical - bit

16

what is a switch?
how does it work?
2 things it is useful for?

1-12

layer 2 network device

learn the MAC address of all devices, connected to it to control traffic flow

1.segment the network to decrease traffic
2.create VLANs to improve flexibility of network design

17

what is a router?
what type of addresses does it use?
what type of table does it use?
2 ways the routing table is built

1-13

layer 3 network device, allows us to reach the internet

logical addresses

routing table

1.manual entry
2.routing protocols

18

what is a multi-layer switch?

1-13

a switch with layer 2 AND layer 3 capabilities

19

what's the difference between active and passive hubs?

1-13

active - plugged into a power source, it can amplify the signal

passive - only provides connectivity

20

how are bridges similar to switches?
how are they different from switches?
explain the 2 types of bridges

1-15

can learn MAC addresses

much slower

1.transparent bridge - connects two dissimilar networks, but is invisible to them, offers no translation
2.source routing - performs translation between 2 dissimilar networks

21

IPv4 is 32 bit with a ____ ____ format.

tell me the 1st octet ranges for classes A,B,C,D

1-16

dotted decimal

A - 1-126 (127)
B - 128-191
C - 192-223
D - 224-239

22

tell me the private IP address ranges and their default subnet masks.

1-17

A - 10.0.0.0-10.255.255.255 255.0.0.0
B - 172.16.0.0-172.31.255.255 255.255.0.0
C - 192.168.0.0-192.168.255.255 255.255.255.0

23

starting with decimal format go 0 thru 15, then do it again in binary, then again in hex

1-19,20

write it out!

24

how many bits in IPv6?
successive fields of zeroes are written as what?
how big is 2^128?
how would you describe a MAC address format?

1-20,21

128
::
3.4x10^38
6 pairs of hex characters separated by a dash OR space

25

what does subnetting create?

1-22

broadcast domains

26

give quick explanations for unicast, multicast, broadcast

what does an APIPA address begin with?

1-26,27

unicast - one source address and one destination address

multicast - one source to many destinations

broadcast - one to all

169.254

27

when looking at the most common routing protocols, what are the 3 main categories?

within these categories, what are the 4 most common types?

1-29

link state
distance vector
hybrid

link state - OSPF, IS-IS
distance vector - RIP and RIPv2

28

explain EIGRP

how is its metric more sophisticated than RIP?

1-28

enhanced interior gateway routing protocol

a cisco proprietary protocol, combines distance vector with link state protocols

uses connection bandwidth and delay

29

what is OSPF?
what algorithm does it use?
what's its big advantage?
T/F: the most common link state protocol

1-28

open shortest path first
uses the shortest path first algorithm, from Dijkstra
FAST convergence when there's a change in the network
true

30

explain RIP

1-28

routing information protocol

obsolete, replaced by RIPv2, OSPF,IS-IS

uses a "hop" count