Chapter 3: Exploring Network Technologies and Tools

Question 1

Transmission Control Protocol (TCP)

Answer 1

Connection oriented traffic with a guaranteed delivery. Three way handshake (SYN, SYN/ACK, ACK).

Question 2

User Datagram Protocol (UDP)

Answer 2

Stripped down version of TCP. Commonly used for audio/video.

Question 3

Internet Control Message Protocol (ICMP)

Answer 3

Testing connectivity with tools such as ping, pathping, and tracert.

Question 4

Real-Time Transport Protocol (RTP)/(SRTP)

Answer 4

Delivers audio and video over IP networking. Secure provides encryption, message authentication, and integrity.

Question 5

File Transfer Protocol (FTP) #

Answer 5

Active mode use TCP port 21 for control signals and 20 for data.

Question 6

Secure Shell (SSH) #

Answer 6

Encrypts traffic in transit. Uses TCP port 22.

Question 7

Transport Layer Security

Answer 7

Replacement for Security Sockets Layer (SSL).

Question 8

Secure File Transfer Protocol (SFTP) #

Answer 8

TCP port 22.

Question 9

Simple Mail Transfer Protocol (SMTP) #

Answer 9

TCP port 25 and port 587 for encryption with TLS.

Question 10

Post Office Protocol v3 (POP3) #

Answer 10

TCP port 110 and TCP port 995 for encryption.

Question 11

Internet Message Access Protocol version 4 (IMAP4) #

Answer 11

Stores email on an email server. TCP port 143 and TCP port 993 for encryption.

Question 12

Hypertext Transfer Protocol (HTTP)/(HTTPS) #

Answer 12

Uses TCP port 80 and TCP port 443 for encryption.

Question 13

Lightweight Directory Access Protocol (LDAP)/(LDAPS) #

Answer 13

Specifies formats and methods use to query directories. Uses TCP port 389 and encryption with TLS using TCP port 636.

Question 14

Stateless Firewall

Answer 14

Uses rules implemented in ACLs to identify allowed and blocked traffic.

Question 15

Stateful Firewall

Answer 15

Inspects traffic and makes decisions based on the traffic context or state. A TCP session without a 3-way handshake would be dropped.