Well Known Ports

Question 1

DHCP

Answer 1

upd/67, upd/68

Question 2

DNS

Answer 2

upd/53

Question 3

HTTP

Answer 3

tcp/80

Question 4

HTTPS

Answer 4

tcp/443

Question 5

LDAP

Answer 5

tcp/389

Question 6

LDAPS

Answer 6

tcp/389

Question 7

NTP

Answer 7

upd/123

Question 8

Telnet

Answer 8

tcp/23

Question 9

SSH

Answer 9

tcp/22

Question 10

SMTP

Answer 10

tcp/25

Question 11

SFTP

Answer 11

tcp/22

Question 12

FTP

Answer 12

tcp/22

Question 13

TFTP

Answer 13

udp/69

Question 14

RDP

Answer 14

tcp/3389

Question 15

SIP

Answer 15

tcp/5060

Question 16

SMB

Answer 16

tcp/445

Question 17

POP3

Answer 17

tcp/110

Question 18

IMAP4

Answer 18

tcp/143

Question 19

VoIP

Answer 19

tcp/1720 H.323

Question 20

CSMA/CD

Answer 20

Carrier Sensing Multiple Access (Collision Detection)

Addresses issues of 2 devices talking at the same time

Question 21

Trunk

Answer 21

adding 802.1Q tag to the frame when sending in to the same VLCA, but on a different switch

Question 22

ARP

Answer 22

Address Resolution Protocol
how a device learns the layer 2 address of a device on the same network.
ARP request is a layer 2 broadcast

Question 23

Broadcast

Answer 23

sends to all devices on network. Is a 48-bit, looks like (ff:ff:ff:ff:ff:ff)

Question 24

Switch Port Mirroring

Answer 24

Take packet/frames from one area/port on switch, then forward it to another port, where you can take a closer look at them.
(In CISCO it’s SPAN-Switch Port Mirroring)

Question 25

Dynamic Routing Protocol

Answer 25

Routers talk to each other, sharing the IP addresses they are connected to. (Distance Vector, Link State, Hybrid)

Question 26

Distance Vector

Answer 26

Set of routing protocols that calculates the total cost to get to a particular network ID and compares that cost to the total cost of all the other routes to get to the same network ID. Can use RIP2. Routing by rumor

Question 27

RIP2

Answer 27

Routing Information Protocol- used in distance vector DRP. Max hop count is 15

Question 28

Link State

Answer 28

type of DRP that announces only changes to routing tables, as opposed to entire routing tables. Type OSFP