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Sample CompTIA Network+ N10-009 — 1.0 Networking Concepts questions with explanations

Use these examples to check how the topics are tested. Read the explanation for every option you were unsure about, then start a scored practice set above.

Question 1 1.0 Networking Concepts

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

  • ○ Layer 2 - Data Link
  • ✓ Layer 3 - Network
  • ○ Layer 4 - Transport
  • ○ Layer 7 - Application
Answer: B. Layer 3 - Network
Layer 3 (Network layer) handles logical addressing (IP addresses) and routing. Layer 2 uses MAC addresses, Layer 4 handles transport (TCP/UDP), and Layer 7 is the application layer.
Question 2 1.0 Networking Concepts / 3.0 Network Operations

Which service directory access protocol?

  • ✓ LDAP
  • ○ SFTP
  • ○ TACACS+
  • ○ SYSLOG
Answer: A. LDAP
LDAP: Directory access protocol.
Question 3 1.0 Networking Concepts

Which IP range is link-local?

  • ○ 10.0.0.0/8
  • ○ 192.168.0.0/16
  • ✓ 169.254.0.0/16
  • ○ 127.0.0.0/8
Answer: C. 169.254.0.0/16
169.254.0.0/16 is correct.
Question 4 1.0 Networking Concepts / 3.0 Network Operations

Which DNS record type start of authority, zone info?

  • ○ MX
  • ○ SRV
  • ✓ SOA
  • ○ AAAA
Answer: C. SOA
SOA: Start of Authority, zone info.
Question 5 1.0 Networking Concepts

Which protocol is for diagnostics?

  • ○ UDP
  • ✓ ICMP
  • ○ TCP
  • ○ ARP
Answer: B. ICMP
ICMP (Internet Control Message Protocol) is correct.. It is a fundamental networking protocol/technology tested on the exam. Understanding its purpose and proper configuration is essential for troubleshooting.
Question 6 1.0 Networking Concepts / 3.0 Network Operations

Which DNS record type mail exchange server?

  • ○ NS
  • ○ SRV
  • ○ A
  • ✓ MX
Answer: D. MX
MX: Mail exchange server.
Question 7 1.0 Networking Concepts

Which OSI layer (Layer 5) manages sessions?

  • ✓ Session
  • ○ Physical
  • ○ Data Link
  • ○ Presentation
Answer: A. Session
Layer 5 (Session): Manages sessions.
Question 8 1.0 Networking Concepts / 3.0 Network Operations

Which DNS record type name server for domain?

  • ○ CNAME
  • ✓ NS
  • ○ PTR
  • ○ SOA
Answer: B. NS
NS: Name server for domain.
Question 9 1.0 Networking Concepts

Which DNS record pointer/reverse lookup?

  • ✓ PTR
  • ○ MX
  • ○ SOA
  • ○ AAAA
Answer: A. PTR
PTR: Pointer/reverse lookup.
Question 10 1.0 Networking Concepts / 3.0 Network Operations

Which network service resolves domain names to ip addresses?

  • ✓ DNS
  • ○ TACACS+
  • ○ NTP
  • ○ DHCP
Answer: A. DNS
DNS: Resolves domain names to IP addresses.
Question 11 1.0 Networking Concepts

Which CIDR is 255.255.255.248 with 6 hosts?

  • ✓ /29
  • ○ /24
  • ○ /30
  • ○ /8
Answer: A. /29
/29 = 255.255.255.248, 6 hosts.
Question 12 1.0 Networking Concepts / 3.0 Network Operations

Which DNS record type maps hostname to ipv6 address?

  • ○ SOA
  • ✓ AAAA
  • ○ MX
  • ○ SRV
Answer: B. AAAA
AAAA: Maps hostname to IPv6 address.
Question 13 1.0 Networking Concepts

A technician is troubleshooting a network issue where data is being transmitted but the receiving application is not processing it correctly. The technician suspects a problem with data reassembly at the transport layer. Which step of the TCP three-way handshake ensures that the receiving host is ready to accept data?

  • ○ SYN
  • ✓ SYN-ACK
  • ○ ACK
  • ○ FIN
Answer: B. SYN-ACK
The TCP three-way handshake consists of SYN, SYN-ACK, and ACK. The SYN-ACK segment sent by the receiver acknowledges the sender's SYN and indicates the receiver is ready to establish a connection and allocate buffers for data. The SYN alone only initiates the connection, the ACK finalizes it, and FIN is used to terminate a connection, not establish one.
Question 14 1.0 Networking Concepts / 3.0 Network Operations

Which DNS record type reverse lookup, ip to hostname?

  • ○ A
  • ○ AAAA
  • ✓ PTR
  • ○ CNAME
Answer: C. PTR
PTR: Reverse lookup, IP to hostname.
Question 15 1.0 Networking Concepts

Which CIDR is for 254 hosts?

  • ✓ /24
  • ○ /16
  • ○ /30
  • ○ /8
Answer: A. /24
/24 is correct. This concept is important for the certification exam and appears in scenario-based questions testing your understanding of when and how to apply it.

Open the full CompTIA Network+ N10-009 — 1.0 Networking Concepts question-and-answer guide