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220-1101Exam Domain

Networking (20%)220-1101 Study Guide

22 chapters
~550 min total
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Quick Answer

Candidates must map TCP/UDP ports, configure IPv4/IPv6 addressing and subnetting, and run ipconfig, ping, tracert, and nslookup to diagnose connectivity. Get the port-to-protocol pairs right, especially 22 SSH, 443 HTTPS, and 3389 RDP.

Networking is 20% of CompTIA A+ Core 1 220-1101, covering TCP/IP ports and protocols, IP addressing and subnetting, wireless and wired standards, network services, and troubleshooting tools. The exam tests this through scenario questions asking you to identify a port, choose a cable or wireless standard, configure a client, or diagnose connectivity with the right command.

What the exam tests

  • Matching TCP and UDP ports to services such as SSH 22, DNS 53, HTTPS 443, RDP 3389
  • Distinguishing 802.11 wireless standards, frequencies, and 2.4 GHz versus 5 GHz channel behavior
  • Configuring IPv4 addressing, subnet masks, default gateways, DNS servers, and DHCP versus static assignment
  • Using ipconfig, ping, tracert, nslookup, netstat, and net use to diagnose connectivity faults

Common exam traps

  • Confusing TCP and UDP ports for the same service, such as DNS using both 53 TCP and 53 UDP depending on the query type.
  • Mixing up 2.4 GHz and 5 GHz tradeoffs, assuming higher frequency always gives longer range instead of faster speeds with shorter reach.
  • Forgetting APIPA 169.254.x.x means DHCP failed, then blaming DNS or the default gateway for the connectivity problem.

Networking (20%) Chapters

4

TCP/IP and Common Ports for A+

Objective 2.1 · Networking

25m
5

Wi-Fi Standards and Protocols

Objective 2.2 · Networking

25m
6

Networking Hardware: Routers, Switches, APs

Objective 2.3 · Networking

25m
7

Network Configuration: IP, DNS, DHCP

Objective 2.4 · Networking

25m
8

Internet Connection Types

Objective 2.5 · Networking

25m
42

DNS and DHCP Configuration for A+

Objective 2.1 · Networking

25m
43

IPv4 Address Classes and Ranges

Objective 2.1 · Networking

25m
44

Private vs Public IP Addresses

Objective 2.1 · Networking

25m
45

Subnet Masks and CIDR for A+

Objective 2.1 · Networking

25m
46

IPv6 Basics for A+

Objective 2.1 · Networking

25m
47

Default Gateway Configuration

Objective 2.1 · Networking

25m
48

Network Cable Types: Cat5e, Cat6, Cat6a, Cat8

Objective 2.3 · Networking

25m
49

RJ-45 Crimping and T568A/B Pinouts

Objective 2.3 · Networking

25m
50

Fiber Optic Cables for A+

Objective 2.3 · Networking

25m
51

Wireless Security: WEP, WPA, WPA2, WPA3

Objective 2.2 · Networking

25m
52

Firewall Basics for A+

Objective 2.4 · Networking

25m
53

VPN Basics for A+

Objective 2.4 · Networking

25m
54

Network Command Tools: ping, ipconfig, nslookup, tracert

Objective 2.4 · Networking

25m
55

Home and SOHO Network Setup

Objective 2.3 · Networking

25m
56

Metered Network Connections

Objective 2.4 · Networking

25m
57

Proxy Server Configuration

Objective 2.4 · Networking

25m
58

Common Ports and Protocols for A+

Objective 2.1 · Networking

25m
Start: TCP/IP and Common Ports for A+

Other 220-1101 Domains

Mobile Devices (15%)

20 chapters

Hardware (25%)

38 chapters

Virtualization and Cloud (12%)

12 chapters

Hardware and Network Troubleshooting (28%)

31 chapters

Test your Networking (20%) knowledge

Free 220-1101 practice questions with full explanations. Test what you learn chapter by chapter.

220-1101 Practice Questions