CompTIA A+ Terms

Question 1

DHCP

Answer 1

Dynamic Host Configuration Protocol
• Automates the IP address configuration
• Addresses can be dynamic or static

Question 2

DNS

Answer 2

Domain Name System
• Converts names to IP addresses - udp/53
• www.professormesser.com = 162.159.246.164
• These are very critical resources
• Usually multiple DNS servers are in production

Question 3

APIPA

Answer 3

Automatic Private IP Addressing
• There’s no static address or DHCP server
• Communicate locally (link-local address)
• Assigns 169.254.1.0 to 169.254.254.255
• No Internet connectivity

Question 4

SMB

Answer 4

Server Message Block
• Protocol used by Microsoft Windows
• File sharing, printer sharing
• Also called CIFS (Common Internet File System)

Question 5

FTP

Answer 5

File Transfer Protocol
• tcp/20 (active mode data), tcp/21 (control)
• Transfers files between systems
• Authenticates with a username and password
• Some systems use a generic/anonymous login
• Full-featured functionality
• List, add, delete, etc.

Question 6

SSH

Answer 6

Secure Shell
• Encrypted communication link - tcp/22
• Looks and acts the same as Telnet

Question 7

Telnet

Answer 7

Telnet – Telecommunication Network - tcp/23
• Login to devices remotely
• Console access
• In-the-clear communication
• Not the best choice for production systems

Question 8

SMTP

Answer 8

Simple Mail Transfer Protocol
• Server to server email transfer - tcp/25
• Also used to send mail from a device to a mail server
• Commonly configured on mobile devices
and email clients
• Other protocols are used for clients to receive email
• IMAP, POP3

Question 9

HTTP

Answer 9

• Hypertext Transfer Protocol - tcp/80
• Communication in the browser
• And by other applications

Question 10

HTTPS

Answer 10

Hypertext Transfer Protocol Secure
• In the clear or encrypted - HTTPS - tcp/443
• Supported by nearly all web servers and clients

Question 11

RDP

Answer 11

Remote Desktop Protocol
• Share a desktop from a remote location over tcp/3389
• Remote Desktop Services on many Windows versions
• Can connect to an entire desktop
or just an application
• Clients for Windows, macOS, Linux, Unix,
iPhone, Android, and others

Question 12

SNMP

Answer 12

Simple Network Management Protocol
• Gather statistics from network devices
• Queries: udp/161
• Traps: udp/162
• v1 – The original
• Structured tables, in-the-clear
• v2 – A good step ahead
• Data type enhancements
• Bulk transfers, still in-the-clear
• v3 – A secure standard
• Message integrity
• Authentication, encryption