Networking basics and mobile device concepts covered on the CompTIA A+ exam.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What are the 7 layers of the OSI model, in order from bottom to top?
- Physical, Data Link, Network, Transport, Session, Presentation, Application
- What does DNS do?
- Translates domain names into IP addresses
- What does DHCP do?
- Automatically assigns IP addresses to devices on a network
- What is the purpose of a MAC address?
- Identifies a device uniquely on a local network (Layer 2 / Data Link)
- What is the main difference between IPv4 and IPv6?
- IPv6 uses 128-bit addresses while IPv4 uses 32-bit addresses, providing vastly more available addresses
- What is a subnet mask used for?
- Divides an IP address into a network portion and a host portion
- What is the purpose of a gateway?
- Routes traffic between different networks
- Name two types of firewalls.
- Hardware firewall and software firewall
- What does a VPN do?
- Creates an encrypted tunnel for network traffic, securing data and hiding IP address
- What is the key difference between a router and a switch?
- A router connects networks and uses IP addresses; a switch connects devices within a network and uses MAC addresses
- What port number does HTTP use?
- 80
- What port number does HTTPS use?
- 443
- What port number does SSH use?
- 22
- What port number does RDP use?
- 3389
- What port number does SMTP use?
- 25 (or 587 for TLS-encrypted)