TCP & UDP

Question 1

POP3 Port

Answer 1

TCP 110

Question 2

FTP Port

Answer 2

TCP 20 - Data
TCP 21 - Control Signals

Question 3

SSH Port

Answer 3

TCP 22

Question 4

Telnet Port

Answer 4

TCP 23

Question 5

SMTP Port

Answer 5

TCP 25

Question 6

HTTPS Port

Answer 6

TCP 443

Question 7

HTTP Port

Answer 7

TCP 80

Question 8

DNS Port

Answer 8

UDP 53
TCP 53

Question 9

SNMP Port

Answer 9

UDP 161 - Agent
UDP 162 - Manager

Question 10

Syslog Port

Answer 10

UDP 514

Question 11

DHCP Port

Answer 11

UDP 67 - Server
UDP 68 - Client

Question 12

TFTP Port

Answer 12

UDP 69

Question 13

For applications like real-time voice and video, [TCP/UDP] is preferred.

Answer 13

UDP

Question 14

For applications that require reliable communications, [TCP/UDP] is preferred.

Answer 14

TCP

Question 15

Layer 4 ephemeral port range (according to IANA):

Answer 15

49152 - 65535

Question 16

Layer 4 registered port range (according to IANA):

Answer 16

1024 - 49151

Question 17

Layer 4 well-known port range (according to IANA):

Answer 17

0 - 1023

Question 18

TCP four-way handshake order of messages (terminating a connection):

Answer 18

FIN ->
<- ACK
<- FIN
ACK ->

Question 19

TCP three-way handshake order of messages (establishing a connection):

Answer 19

SYN ->
<- SYN-ACK
ACK ->

Question 20

TCP: […] is used to indicate the sequence number of the next segment the host expects to receive.

Answer 20

Forward acknowledgement

Question 21

TCP: A ‘[…]’ is used to dynamically adjust how large the window size is.

Answer 21

sliding window

Question 22

The Layer 4 [source/destination] port number is randomly selected by the host that initiates the data exchange.

Answer 22

source

Question 23

The Layer 4 destination port number indicates the […] Layer protocol.

Answer 23

Application

Question 24

The TCP header […] field is used for flow control.

Answer 24

window size

Question 25

What are Layer 4 addresses?

Answer 25

Port numbers