CompTIA Network+ (N10-009) practice questions

Domain coverage 5 domains

• Networking Concepts (23%)
• Network Implementation (20%)
• Network Operations (19%)
• Network Security (14%)
• Network Troubleshooting (24%)

Sample questions 10 of 100 shown

1. Q1 Networking Fundamentals

   Which OSI model layer is responsible for logical addressing and routing packets between networks?

   1. Data Link layer
   2. Network layer
   3. Transport layer
   4. Session layer

   The Network layer (Layer 3) handles logical addressing (IP addresses) and determines the best path for data across networks. Routers operate at this layer, forwarding packets based on IP addresses.
2. Q2 Networking Fundamentals

   A network administrator needs to allow only HTTPS traffic into the network while blocking all other inbound connections. Which TCP port must be allowed?

   1. Port 80
   2. Port 443
   3. Port 8080
   4. Port 8443

   HTTPS (HTTP Secure) uses TCP port 443. Port 80 is used for unencrypted HTTP traffic. Ports 8080 and 8443 are common alternative HTTP/HTTPS ports but are not official well-known ports.
3. Q3 Networking Fundamentals

   Which IPv6 address type begins with FE80::/10?

   1. Global unicast address
   2. Link-local address
   3. Multicast address
   4. Loopback address

   IPv6 addresses starting with FE80::/10 (FE80 to FEBF) are link-local addresses. They are automatically configured on all IPv6-enabled interfaces and are valid only within a single network segment—they cannot be routed.
4. Q4 Networking Fundamentals

   A network engineer is configuring a router interface as 10.0.0.95 255.255.255.240. The router is not routing packets to a web server with IP 10.0.0.81/28. What is the best explanation?

   1. The web server is in a different subnet.
   2. The router interface is configured with the broadcast address.
   3. The IP address space is a Class A network.
   4. The subnet is in a private address space.

   With a /28 (255.255.240) subnet mask, each subnet has 16 addresses. The subnet range is 10.0.0.80/28: network address 10.0.0.80, usable addresses 10.0.0.81-10.0.0.94, broadcast address 10.0.0.95. The router interface is configured with the broadcast address, which is not a valid host address.
5. Q5 Networking Fundamentals

   Which protocol can automatically assign IP addresses, subnet masks, default gateways, and DNS server addresses to client devices?

   1. ARP
   2. DHCP
   3. DNS
   4. ICMP

   DHCP (Dynamic Host Configuration Protocol) automatically provides IP configuration to clients. ARP resolves IP addresses to MAC addresses. DNS resolves hostnames to IP addresses. ICMP is used for network diagnostic tools like ping and traceroute.
6. Q6 Networking Fundamentals

   A network technician sees traffic going to 224.7.8.99. Which of the following describes this traffic type?

   1. Broadcast
   2. Unicast
   3. Multicast
   4. Anycast

   The address 224.7.8.99 falls within the IPv4 Class D range (224.0.0.0-239.255.255.255), which is reserved for multicast traffic. Multicast delivers traffic to a specific group of receivers.
7. Q7 Networking Fundamentals

   Which protocol operates at the Application layer and is used to securely transfer files between a client and a server over an encrypted connection?

   1. FTP
   2. TFTP
   3. SFTP
   4. SCP

   SFTP (SSH File Transfer Protocol) provides secure file transfer over an encrypted SSH connection (TCP port 22). FTP transmits data in cleartext. TFTP uses UDP with no authentication. SCP also uses SSH but SFTP provides more complete file management capabilities.
8. Q8 Networking Fundamentals

   Which DNS record type maps a hostname to an IPv4 address?

   1. AAAA record
   2. CNAME record
   3. A record
   4. MX record

   An A (Address) record maps a hostname to a 32-bit IPv4 address. AAAA records map to IPv6 addresses. CNAME records create aliases. MX records specify mail servers.
9. Q9 Networking Fundamentals

   A network administrator needs to divide a Class B network into four equal subnets, each with a host range of 1,000 hosts. Which subnet mask should be used?

   1. 255.255.0.0
   2. 255.255.252.0
   3. 255.255.255.0
   4. 255.255.255.128

   A /22 subnet mask (255.255.252.0) provides 10 host bits, yielding 2^10 = 1024 total addresses or 1022 usable hosts per subnet. This fits the requirement of ~1,000 hosts per subnet.
10. Q10 Networking Fundamentals

    A network administrator needs to add 255 usable IP addresses to the network. A /24 is currently in use. Which prefix would fulfill this need?

    1. /23
    2. /25
    3. /29
    4. /32

    A /23 subnet provides 512 total addresses, of which 510 are usable. This satisfies the need for 255 additional addresses. /25 provides only 126 usable addresses, /29 provides 6, and /32 provides only 1.

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