-Section 4: Data Transport Over Networks

Question 1

Port number range

Answer 1

0 - 65,535

Question 2

Reserved Ports (Well-known)

Answer 2

0 - 1023

Question 3

Ephemeral Ports (Dynamic)

Answer 3

1024 - 65,535

Question 4

Overhead of TCP

Answer 4

20 bytes

Question 5

Overhead of UDP

Answer 5

8 bytes

Question 6

FTP / Port(s)

Answer 6

File Transfer Protocol / ports 20, 21
▪ Transfers files between a client and server
▪ Unsecure method
▪ Data transferred in the clear

Question 7

SSH / Port(s)

Answer 7

Secure Shell / 22
▪ Cryptographic network protocol for operating network services securely over an unsecured network
▪ Best known for remote login to computer systems by users

Question 8

SFTP / Port(s)

Answer 8

Secure Shell File Transfer Protocol / 22
▪ Provides file access, file transfer, and file management over any reliable data stream

Question 9

Telnet / Port(s)

Answer 9

23
▪ Provides bidirectional interactive text-oriented communication using a virtual terminal connection
▪ Like SSH, but unsecure

Question 10

SMTP / Port(s)

Answer 10

Simple Mail Transfer Protocol / 25
▪ Internet standard for sending electronic mail

Question 11

DNS / Port(s)

Answer 11

Domain Name Service / 53
▪ Hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network
▪ Converts domain names to IP addresses

Question 12

DHCP / Port(s)

Answer 12

Dynamic Host Control Protocol / 67, 68
▪ DHCP server dynamically assigns an IP address and other network configuration parameters to a client
▪ Enables computers to request IP addresses and networking parameters automatically
▪ Reduces burden on network administrators

Question 13

TFTP / Port(s)

Answer 13

Trivial File Transfer Protocol / 69
▪ Transmits files in both directions of a client-server application
▪ Used for booting an operating system from a local area network file server
▪ Doesn’t provide user authentication or directory visibility
▪ A stripped-down version of FTP

Question 14

HTTP / Port(s)

Answer 14

Hyper Text Transfer Protocol / 80
▪ Designed for distributed, collaborative, and hypermedia presentation across many devices

Question 15

POP3 / Port(s)

Answer 15

Post Office Protocol v3 / 110
▪ Used by local e-mail clients to retrieve e-mail from a remote server over TCP/IP connection

Question 16

NTP / Port(s)

Answer 16

Network Time Protocol / 123
▪ Provides clock synchronization between computer systems over packet-switched, variable-latency data networks

Question 17

NetBIOS / Port(s)

Answer 17

Network Basic Input-Output System / 139
▪ Services allowing applications on separate computers to communicate over a local area network for file and printer sharing

Question 18

IMAP / Port(s)

Answer 18

Internet Mail Application / 143
▪ Provides e-mail clients to retrieve e-mail messages from a mail server over a TCP/IP connection.
▪ Allows the end user to view and manipulate the messages as if they’re stored locally

Question 19

SNMP / Port(s)

Answer 19

Simple Network Management Protocol / 161
▪ Provides collection and management of information about managed devices on IP networks
▪ Can modify that information to change device behavior, commonly used in network devices

Question 20

LDAP / Port(s)

Answer 20

Lightweight Directory Access Protocol / 389
▪ Vendor-neutral, industry standard for accessing and maintaining distributed directory information services (usernames, passwords, email addresses, printer connections, and other static data within directories)
▪ Active Directory use this port

Question 21

HTTPS / Port(s)

Answer 21

Hypertext Transfer Protocol Secure / 443
▪ Adds security to the unsecure HTTP protocol

Question 22

SMB / Port(s)

Answer 22

Server Message Block / 445
▪ Shared access to files, printers, and miscellaneous communications between devices

Question 23

LDAPS / Port(s)

Answer 23

Light Weight Directory Access Protocol Secure / 636
▪ Vendor-neutral, industry standard for accessing and maintaining distributed directory information services
▪ LDAP and Active Directory use this port

Question 24

RDP / Port(s)

Answer 24

Remote Desktop Protocol / 3389
▪ Proprietary protocol developed by Microsoft
▪ Provides a graphical interface to connect to another computer over a network connection

Question 25

SIP / Port(s)

Answer 25

Session Initiation Protocol / 5060, 5061
▪ For Internet telephony for voice and video calls, VOIP, and instant messaging