Cisco Ccna (200-301) - Exam 2026/2027 | Networking Certification | 100 Verified Q&A | Detailed Rationales | Ngn-Aligned | Pass Guaranteed – A+ Graded

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CISCO CCNA (200-301) - EXAM 2026/2027 |
NETWORKING CERTIFICATION | 100 VERIFIED
Q&A | DETAILED RATIONALES | NGN-ALIGNED |
PASS GUARANTEED – A+ GRADED

SECTION I: NETWORK FUNDAMENTALS - Questions 1-20



Q1: OSI Model Layers

The student is reviewing the OSI model. Which layer is responsible for logical addressing and
routing?

A. Data Link Layer (Layer 2)
B. Network Layer (Layer 3)
C. Transport Layer (Layer 4)
D. Session Layer (Layer 5)

Correct Answer: B

Rationale: The Network Layer (Layer 3) handles logical addressing (IP addresses) and routing of
packets between networks. [100% CORRECT]



Q2: TCP vs. UDP

The student is reviewing transport protocols. Which protocol is connection-oriented and provides
reliable delivery?

A. UDP
B. TCP
C. ICMP
D. ARP

Correct Answer: B

Rationale: TCP is connection-oriented, uses acknowledgments, and provides reliable, ordered
delivery. UDP is connectionless and unreliable. [100% CORRECT]



Q3: TCP Three-Way Handshake

The student is reviewing TCP. What is the correct order of the TCP three-way handshake?

A. SYN, ACK, SYN-ACK
B. SYN, SYN-ACK, ACK
C. ACK, SYN, SYN-ACK
D. SYN-ACK, SYN, ACK

,2


Correct Answer: B

Rationale: The handshake is SYN → SYN-ACK → ACK, establishing a reliable connection. [100%
CORRECT]



Q4: IPv4 Address Classes

The student is reviewing IPv4. What is the default subnet mask for a Class B address?

A. 255.0.0.0
B. 255.255.0.0
C. 255.255.255.0
D. 255.255.255.255

Correct Answer: B

Rationale: Class B addresses (128–191) use a default subnet mask of 255.255.0.0 (/16). [100%
CORRECT]



Q5: Private IP Addresses

The student is reviewing IP addressing. Which of the following is a private IPv4 address?

A. 8.8.8.8
B. 172.16.1.1
C. 192.169.1.1
D. 11.0.0.1

Correct Answer: B

Rationale: Private ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. 172.16.1.1 falls in the
172.16.0.0/12 range. [100% CORRECT]



Q6: Subnetting

The student is reviewing subnetting. How many usable hosts are in a /27 subnet?

A. 30
B. 32
C. 14
D. 62

Correct Answer: A

Rationale: A /27 has 32 addresses; subtract 2 (network and broadcast) = 30 usable hosts. [100%
CORRECT]



Q7: MAC Address

The student is reviewing Ethernet. What is the length of a MAC address?

, 3


A. 32 bits
B. 48 bits
C. 64 bits
D. 128 bits

Correct Answer: B

Rationale: MAC addresses are 48 bits (6 bytes), typically written as 12 hexadecimal digits. [100%
CORRECT]



Q8: ARP

The student is reviewing ARP. What is the purpose of ARP?

A. To resolve IP addresses to MAC addresses
B. To resolve MAC addresses to IP addresses
C. To route packets between networks
D. To assign IP addresses dynamically

Correct Answer: A

Rationale: ARP (Address Resolution Protocol) resolves a known IPv4 address to a MAC address on a
local network. [100% CORRECT]



Q9: DNS

The student is reviewing DNS. What is the primary function of DNS?

A. To assign IP addresses dynamically
B. To resolve domain names to IP addresses
C. To route packets between networks
D. To encrypt network traffic

Correct Answer: B

Rationale: DNS (Domain Name System) translates human-readable domain names into IP addresses.
[100% CORRECT]



Q10: DHCP

The student is reviewing DHCP. What is the purpose of DHCP?

A. To resolve domain names
B. To assign IP addresses dynamically
C. To route packets
D. To encrypt traffic

Correct Answer: B

Rationale: DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses and other
network parameters to devices. [100% CORRECT]