Domain 1 Review: Network Fundamentals

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Domain 1 Review: Network Fundamentals

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Lesson format10 sections1 code block3 practice itemsUpdated Oct 2, 2026

Domain 1 is foundational — everything else in the exam assumes you know it. If you're shaky on subnetting, IP addressing, or the OSI model, fix that first. Don't try to learn OSPF while you're still confused about subnet masks. Get the fundamentals solid, then move on.

#The Must-Knows for Domain 1#link

▪OSI seven layers and what each does (or what breaks at each)
▪TCP/IP four-layer model and mapping to OSI
▪TCP three-way handshake, TCP vs. UDP, port numbers of common protocols
▪IPv4 address structure, subnetting, VLSM, CIDR notation
▪IPv6 address structure, abbreviation, address types (GUA, link-local, ULA)
▪Public vs. private addressing (RFC 1918)
▪Ethernet frame structure, MAC address format
▪Topologies: star, mesh, spine-leaf, collapsed core
▪Cabling: Cat 5e/6/6a, fiber types, distance limits
▪TCP/UDP ports: 20/21 FTP, 22 SSH, 23 Telnet, 25 SMTP, 53 DNS, 67/68 DHCP, 69 TFTP, 80/443 HTTP/HTTPS, 161/162 SNMP, 514 Syslog

#The Subnetting Speed Drill#link

bash

# Time yourself. Aim for under 30 seconds per question.

# Q: What is the subnet and broadcast for 192.168.10.75/26?
# Subnet: 192.168.10.64
# Broadcast: 192.168.10.127
# Usable hosts: 192.168.10.65 - 192.168.10.126 (62 hosts)

# Q: How many subnets and hosts per subnet for a /22?
# Subnets: 4 (from /24 perspective) OR 1024 (from /8)
# Hosts per subnet: 1022

# Q: What is the IPv6 abbreviation of 2001:0db8:0000:0000:0000:0000:0000:0001?
# 2001:db8::1

#Domain 1 Practice Questions#link

★ 15 XPmedium

quiz BLOCK (★ 15 XP)

A host has IP 10.20.30.100/27. What is its broadcast address?

Select your proof vectors above

★ 15 XPeasy

quiz BLOCK (★ 15 XP)

Which of the following is a valid link-local IPv6 address?

Select your proof vectors above

★ 20 XPmedium

quiz BLOCK (★ 20 XP)

You need to subnet 172.16.0.0/16 into subnets that each support 1000 hosts. What prefix length should you use?

Select your proof vectors above

tip

Domain 1 is 20% of the exam. If you can answer all three practice questions above quickly and correctly, you're in good shape. If any were slow or wrong, spend more time on that specific topic before the exam.

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The Must-Knows for Domain 1 The Subnetting Speed Drill Domain 1 Practice Questions

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October 2, 2026

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Laboratory sanity code

Isolate active probes on matched virtual networks and keep execution streams sandboxed.

# Time yourself. Aim for under 30 seconds per question.

# Q: What is the subnet and broadcast for 192.168.10.75/26?

# Subnet: 192.168.10.64

# Broadcast: 192.168.10.127

# Usable hosts: 192.168.10.65 - 192.168.10.126 (62 hosts)

# Q: How many subnets and hosts per subnet for a /22?

# Subnets: 4 (from /24 perspective) OR 1024 (from /8)

# Hosts per subnet: 1022

# Q: What is the IPv6 abbreviation of 2001:0db8:0000:0000:0000:0000:0000:0001?

# 2001:db8::1