CompTIA Network+ Network+ Networking Fundamentals 3 — Questions and Answers
Question 1: What is the valid host range for the subnet 192.168.10.64/26?
- 192.168.10.65 – 192.168.10.126 (Correct answer)
- 192.168.10.64 – 192.168.10.127
- 192.168.10.65 – 192.168.10.128
- 192.168.10.66 – 192.168.10.127
Correct answer: 192.168.10.65 – 192.168.10.126
A /26 subnet has 64 addresses; the network address is .64 and broadcast is .127, leaving .65–.126 as valid hosts.
Question 2: Which IPv6 address type is equivalent to IPv4 private addresses and is routable only within a site?
- Global unicast
- Link-local
- Unique local (Correct answer)
- Anycast
Correct answer: Unique local
Unique local addresses (FC00::/7) are the IPv6 equivalent of RFC 1918 private addresses and are not routed on the global internet.
Question 3: A host needs to determine the MAC address of another host on the same subnet. Which protocol does it use?
- RARP
- ICMP
- ARP (Correct answer)
- DNS
Correct answer: ARP
ARP (Address Resolution Protocol) maps a known IP address to its corresponding MAC address on a local network segment.
Question 4: What is the maximum transmission unit (MTU) for standard Ethernet frames?
- 512 bytes
- 1024 bytes
- 1500 bytes (Correct answer)
- 9000 bytes
Correct answer: 1500 bytes
Standard Ethernet has an MTU of 1500 bytes; jumbo frames can use 9000 bytes but require explicit configuration.
Question 5: Which statement best describes a collision domain?
- A group of devices that share the same broadcast traffic
- A network segment where devices compete for the same shared medium (Correct answer)
- All devices reachable through a single router interface
- The range of IP addresses assigned to a single VLAN
Correct answer: A network segment where devices compete for the same shared medium
A collision domain is a network segment where simultaneous transmissions cause collisions; switches break collision domains per port.
Question 6: Which protocol automatically assigns IP addresses, subnet masks, default gateways, and DNS server addresses to clients?
- ARP
- DHCP (Correct answer)
- SNMP
- NTP
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) dynamically provides IP configuration to network clients using a Discover, Offer, Request, Acknowledge sequence.
Question 7: At which OSI layer do hubs operate?
- Layer 1 — Physical (Correct answer)
- Layer 2 — Data Link
- Layer 3 — Network
- Layer 4 — Transport
Correct answer: Layer 1 — Physical
Hubs are Layer 1 devices that simply repeat electrical signals to all ports with no intelligence about addressing.
CompTIA Network+ Network+ Networking Fundamentals 3
What is the valid host range for the subnet 192.168.10.64/26?