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?
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Physical, Data Link, Network, Transport, Session, Presentation, Application- What does DNS do?
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Translates domain names into IP addresses- What does DHCP do?
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Automatically assigns IP addresses to devices on a network- What is the purpose of a MAC address?
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Identifies a device uniquely on a local network (Layer 2 / Data Link)- What is the main difference between IPv4 and IPv6?
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IPv6 uses 128-bit addresses while IPv4 uses 32-bit addresses, providing vastly more available addresses- What is a subnet mask used for?
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Divides an IP address into a network portion and a host portion- What is the purpose of a gateway?
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Routes traffic between different networks- Name two types of firewalls.
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Hardware firewall and software firewall- What does a VPN do?
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Creates an encrypted tunnel for network traffic, securing data and hiding IP address- What is the key difference between a router and a switch?
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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?
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80- What port number does HTTPS use?
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443- What port number does SSH use?
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22- What port number does RDP use?
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3389- What port number does SMTP use?
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25 (or 587 for TLS-encrypted)
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