Futanals

Question 1

What does the physical layer use?

Answer 1

Bits (no shits!)

Question 2

What are the types is network media

Answer 2

Copper
Fiber
Wireless

Question 3

UTP types

Answer 3

Strait through
Crossover
Rollover

Question 4

Fiber modes

Answer 4

Single mode

Multi mode

Question 5

What is CSMA/CA

Answer 5

Collision detect 
Shared medium 
Listen till medium is not busy
When collision ever one pulls out
Random timer to resend

Question 6

What is CSMA/CA

Answer 6

Collision avoidance
Waits till medium is not busy
Used today

Question 7

Name the frame structure

Answer 7

[Dest Mac]
[Source Mac]
[T/L]
[Data]
[FCS]

Question 8

Give me that MAC address deets

Answer 8

48 bit hex

Burnt in

Question 9

How does the ARP table work?

Answer 9

Connects dest macs and ports.
Maintains and updates in real time
If Mac is not known it broadcasts

Question 10

What is a trunk?

Answer 10

Trunk Is a path switches that takes multiple vlans using a tag system
Protocol 802.1q

Question 11

STP STEPS

Answer 11

1. Select Root switch
2. Select Root port
3. Select designated/ blocked ports

Question 12

Ip characteristics

Answer 12

Wireless
Media independent
Best effort
32 bit dotted decimal

Question 13

IPv4 header

Answer 13

Version
TOS type of service
TTL Time to live
Protocol

Question 14

What is the Ip structure?

Answer 14

First half is the network, second half is host

Question 15

IP address class ranges

Answer 15

Class A:
0-127 
Class B:
128-191
Class C:
192-239

Question 16

Ip private addresses

Answer 16

Class A: 
Every thing in the 10.0.0.0 
Class B:
172.16.0.0 172.31.255.255
Class c: 
192.168.0.0 192.168.255.255

Question 17

What layer is DHCP and what does it do?

Answer 17

Layer 3 network

Gets the hosts IP address from the DHCP server

Question 18

How does DHCP work?

Answer 18

Discover 
-host sends request for DHCP sequence 
Offer
-DHCP offers a ip 
Request
-host requests to use ip 
Acknowledge 
-DHCP affirms the lease

Question 19

What is routing used for?

Answer 19

To reach hosts on other networks

Question 20

What is NAT

Answer 20

Network address translation

Conserves IPv4 addresses

Question 21

What is RIP and OSPF

Answer 21

A routing protocol used to exchange info about networks to calculate the best path

Question 22

How does RIP work

Answer 22

Uses distance vectors
(Routers only know what there neibors tell them)

Sends all RIP routes every 30 sec

Based on metric hop count

Question 23

How does OSPF work

Answer 23

Open shortest path first 
LinkState 
-all info sent to all routers 
-all routers have a complete map
Based on areas 
Based on link speed

Question 24

OSPF neighbors

Answer 24

OSPF routers send a hello every 10 sec. if no reply after 40 sec neighbor is dead

Question 25

How long is a IPV6 address?

Answer 25

128 64 host 64 net

Question 26

Link local unicast address

Answer 26

FE08::/10

Question 27

IPv6 global unicast structure

Answer 27

(x) x.x.x.x Global routing prefix Subnet Interface ID

Question 28

What does the transport layer do?

Answer 28

Responsible for delivery of segments. | Uses ports

Question 29

What's the point of point #

Answer 29

Port # used by TCP and UDP TO tell the difference between applications

Question 30

Characteristics of TCP

Answer 30

Provides reliable delivery Stageful Segments and reassembles data segments. Flow control Layer 4

Question 31

How does TCP reliable

Answer 31

Each byte is given a sequence # uses to reassemble Destination replay with the ACK to acknowledge right amount

Question 32

TCP header fields

Answer 32

Port # Sequence # Acknowledgement # Window size

Question 33

Explain the TCP 3 way handshake

Answer 33

Computer A sends a syn1 | Comp two returns an ack of 2 and a syn of 1 comp A returns a syn and ack of 2

Question 34

What is tcp window size

Answer 34

TCP uses window size to manage data

Question 35

What is UDP

Answer 35

It is a connection protocol that is faster then TCP and cheaper but lacks many of the features TCP has Layer 4

Question 36

What port is HTTP

Answer 36

80

Question 37

What is FTP and what layer is it on?

Answer 37

File transfer protocol Used to send it copy files from a server Port 20-21

Question 38

What is telnet?

Answer 38

Commands and data sent as plain text

Question 39

What is SSH

Answer 39

Commands and data are encrypted

Question 40

Email its ports and its protocols

Answer 40

SMTP 25 POP3 110 IMAP143

Question 41

What layer is DNS and what does it do?

Answer 41

Domain name system It translates the host name you typed in to an IP address Layer 7 application