Cisco CCNA 200-301 Exam Dumps (2026)
Comprehensive Practice Examination (150 Questions)
Domain 1: Network Fundamentals (Questions 1-35)
Question 1: Which OSI layer is responsible for routing and forwarding data packets?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Answer: C) Network Layer
Rationale: The Network Layer (Layer 3) of the OSI model is responsible for logical addressing, routing, and
forwarding of data packets. It determines the best path for data to travel from source to destination across
multiple networks. IP operates at this layer, providing logical addressing (IP addresses) and routing
decisions.
Question 2: Which of the following is a valid MAC address format?
A) 00-14-22-01-23-45
B) 192.168.1.1
C) 2001:0db8:85a3::8a2e:0370:7334
D) 10.0.0.1/24
Answer: A) 00-14-22-01-23-45
Rationale: A MAC (Media Access Control) address is a 48-bit hexadecimal address typically represented
as six groups of two hexadecimal digits separated by colons (:), hyphens (-), or periods (.). Example:
00:14:22:01:23:45 or 00-14-22-01-23-45. Option B is an IPv4 address, Option C is an IPv6 address, and
Option D is an IPv4 address with a subnet mask.
Question 3: What is the purpose of the Address Resolution Protocol (ARP)?
A) To resolve IP addresses to MAC addresses
B) To resolve MAC addresses to IP addresses
C) To resolve domain names to IP addresses
D) To resolve hostnames to MAC addresses
Answer: A) To resolve IP addresses to MAC addresses
Rationale: ARP is used to map an IP address to a MAC address on a local network segment. When a
device needs to send data to another device on the same network, it uses ARP to find the destination MAC
,address. ARP requests are broadcast, and the device with the matching IP address responds with its MAC
address.
Question 4: Which protocol is used to assign IP addresses dynamically to devices on a network?
A) DNS
B) DHCP
C) ARP
D) ICMP
Answer: B) DHCP
Rationale: Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses,
subnet masks, default gateways, and other network parameters to devices. This eliminates the need for
manual IP configuration and reduces the risk of IP address conflicts. DHCP uses UDP ports 67 (server)
and 68 (client).
Question 5: The TCP/IP model consists of how many layers?
A) 4
B) 5
C) 7
D) 3
Answer: A) 4
Rationale: The TCP/IP model has 4 layers: (1) Application Layer (combines OSI Layers 5-7), (2) Transport
Layer (OSI Layer 4), (3) Internet Layer (OSI Layer 3), and (4) Network Access/Link Layer (combines OSI
Layers 1 and 2). The OSI model has 7 layers. The TCP/IP model is a more practical, simplified model that
reflects actual network protocols.
Question 6: Which of the following is a connection-oriented transport layer protocol?
A) UDP
B) TCP
C) ICMP
D) ARP
Answer: B) TCP
Rationale: TCP (Transmission Control Protocol) is a connection-oriented protocol that establishes a reliable
connection before data transmission. It provides error checking, flow control, and sequence numbering to
ensure data is delivered reliably and in order. UDP (User Datagram Protocol) is connectionless and
provides no reliability guarantees.
,Question 7: Which protocol operates at the Transport Layer and is connectionless?
A) TCP
B) UDP
C) IP
D) ICMP
Answer: B) UDP
Rationale: UDP (User Datagram Protocol) is a connectionless transport layer protocol that provides no
reliability, flow control, or error recovery. It is used for applications where speed is more important than
reliability (e.g., VoIP, video streaming, DNS). It has a smaller header (8 bytes) compared to TCP's 20-byte
header.
Question 8: What is the default administrative distance for OSPF?
A) 90
B) 110
C) 120
D) 1
Answer: B) 110
Rationale: Administrative distance (AD) is a measure of the trustworthiness of a routing protocol. Lower AD
values are preferred. Default AD values: Connected interface = 0, Static route = 1, EIGRP = 90, OSPF =
110, RIP = 120, External EIGRP = 170, and Unknown = 255. OSPF has an AD of 110.
Question 9: Which routing protocol uses hop count as its metric?
A) OSPF
B) EIGRP
C) RIP
D) BGP
Answer: C) RIP
Rationale: RIP (Routing Information Protocol) uses hop count as its metric, with a maximum of 15 hops.
OSPF uses cost (based on bandwidth), EIGRP uses a composite metric (bandwidth, delay, reliability, load,
MTU), and BGP uses a complex set of attributes (e.g., AS path length, local preference, MED).
Question 10: What is the purpose of a subnet mask?
A) To define the network and host portions of an IP address
B) To provide a default gateway address
C) To assign a MAC address
D) To encrypt data
, Answer: A) To define the network and host portions of an IP address
Rationale: A subnet mask is a 32-bit number that separates an IP address into the network address and
host address portions. It tells devices which part of the IP address represents the network and which part
identifies the host. For example, with a /24 mask (255.255.255.0), the first three octets are network and the
last octet is host.
Question 11: The IP address 192.168.1.10/24 has which network address?
A) 192.168.1.0
B) 192.168.1.10
C) 192.168.1.255
D) 192.168.0.0
Answer: A) 192.168.1.0
Rationale: With a /24 subnet mask (255.255.255.0), the network portion is the first three octets (192.168.1).
The network address is obtained by performing a bitwise AND between the IP address and the subnet
mask. The network address is 192.168.1.0. The broadcast address is 192.168.1.255.
Question 12: What is the broadcast address for the network 10.0.0.0/8?
A) 10.255.255.255
B) 255.255.255.255
C) 10.0.0.255
D) 10.0.255.255
Answer: A) 10.255.255.255
Rationale: For a /8 subnet mask (255.0.0.0), the network address is 10.0.0.0. The broadcast address is the
last address in the network, which is 10.255.255.255. The broadcast address has all host bits set to 1. This
address is used to send data to all hosts on the local network.
Question 13: Which of the following is a private IP address range?
A) 172.16.0.0 to 172.31.255.255
B) 8.8.8.0 to 8.8.8.255
C) 192.168.1.0 to 192.168.1.255
D) 10.0.0.0 to 10.255.255.255
E) Both A and D
Answer: E) Both A and D
Rationale: Private IP address ranges are defined by RFC 1918: (1) 10.0.0.0 - 10.255.255.255 (/8), (2)
172.16.0.0 - 172.31.255.255 (/12), and (3) 192.168.0.0 - 192.168.255.255 (/16). These addresses are not
Comprehensive Practice Examination (150 Questions)
Domain 1: Network Fundamentals (Questions 1-35)
Question 1: Which OSI layer is responsible for routing and forwarding data packets?
A) Physical Layer
B) Data Link Layer
C) Network Layer
D) Transport Layer
Answer: C) Network Layer
Rationale: The Network Layer (Layer 3) of the OSI model is responsible for logical addressing, routing, and
forwarding of data packets. It determines the best path for data to travel from source to destination across
multiple networks. IP operates at this layer, providing logical addressing (IP addresses) and routing
decisions.
Question 2: Which of the following is a valid MAC address format?
A) 00-14-22-01-23-45
B) 192.168.1.1
C) 2001:0db8:85a3::8a2e:0370:7334
D) 10.0.0.1/24
Answer: A) 00-14-22-01-23-45
Rationale: A MAC (Media Access Control) address is a 48-bit hexadecimal address typically represented
as six groups of two hexadecimal digits separated by colons (:), hyphens (-), or periods (.). Example:
00:14:22:01:23:45 or 00-14-22-01-23-45. Option B is an IPv4 address, Option C is an IPv6 address, and
Option D is an IPv4 address with a subnet mask.
Question 3: What is the purpose of the Address Resolution Protocol (ARP)?
A) To resolve IP addresses to MAC addresses
B) To resolve MAC addresses to IP addresses
C) To resolve domain names to IP addresses
D) To resolve hostnames to MAC addresses
Answer: A) To resolve IP addresses to MAC addresses
Rationale: ARP is used to map an IP address to a MAC address on a local network segment. When a
device needs to send data to another device on the same network, it uses ARP to find the destination MAC
,address. ARP requests are broadcast, and the device with the matching IP address responds with its MAC
address.
Question 4: Which protocol is used to assign IP addresses dynamically to devices on a network?
A) DNS
B) DHCP
C) ARP
D) ICMP
Answer: B) DHCP
Rationale: Dynamic Host Configuration Protocol (DHCP) automates the assignment of IP addresses,
subnet masks, default gateways, and other network parameters to devices. This eliminates the need for
manual IP configuration and reduces the risk of IP address conflicts. DHCP uses UDP ports 67 (server)
and 68 (client).
Question 5: The TCP/IP model consists of how many layers?
A) 4
B) 5
C) 7
D) 3
Answer: A) 4
Rationale: The TCP/IP model has 4 layers: (1) Application Layer (combines OSI Layers 5-7), (2) Transport
Layer (OSI Layer 4), (3) Internet Layer (OSI Layer 3), and (4) Network Access/Link Layer (combines OSI
Layers 1 and 2). The OSI model has 7 layers. The TCP/IP model is a more practical, simplified model that
reflects actual network protocols.
Question 6: Which of the following is a connection-oriented transport layer protocol?
A) UDP
B) TCP
C) ICMP
D) ARP
Answer: B) TCP
Rationale: TCP (Transmission Control Protocol) is a connection-oriented protocol that establishes a reliable
connection before data transmission. It provides error checking, flow control, and sequence numbering to
ensure data is delivered reliably and in order. UDP (User Datagram Protocol) is connectionless and
provides no reliability guarantees.
,Question 7: Which protocol operates at the Transport Layer and is connectionless?
A) TCP
B) UDP
C) IP
D) ICMP
Answer: B) UDP
Rationale: UDP (User Datagram Protocol) is a connectionless transport layer protocol that provides no
reliability, flow control, or error recovery. It is used for applications where speed is more important than
reliability (e.g., VoIP, video streaming, DNS). It has a smaller header (8 bytes) compared to TCP's 20-byte
header.
Question 8: What is the default administrative distance for OSPF?
A) 90
B) 110
C) 120
D) 1
Answer: B) 110
Rationale: Administrative distance (AD) is a measure of the trustworthiness of a routing protocol. Lower AD
values are preferred. Default AD values: Connected interface = 0, Static route = 1, EIGRP = 90, OSPF =
110, RIP = 120, External EIGRP = 170, and Unknown = 255. OSPF has an AD of 110.
Question 9: Which routing protocol uses hop count as its metric?
A) OSPF
B) EIGRP
C) RIP
D) BGP
Answer: C) RIP
Rationale: RIP (Routing Information Protocol) uses hop count as its metric, with a maximum of 15 hops.
OSPF uses cost (based on bandwidth), EIGRP uses a composite metric (bandwidth, delay, reliability, load,
MTU), and BGP uses a complex set of attributes (e.g., AS path length, local preference, MED).
Question 10: What is the purpose of a subnet mask?
A) To define the network and host portions of an IP address
B) To provide a default gateway address
C) To assign a MAC address
D) To encrypt data
, Answer: A) To define the network and host portions of an IP address
Rationale: A subnet mask is a 32-bit number that separates an IP address into the network address and
host address portions. It tells devices which part of the IP address represents the network and which part
identifies the host. For example, with a /24 mask (255.255.255.0), the first three octets are network and the
last octet is host.
Question 11: The IP address 192.168.1.10/24 has which network address?
A) 192.168.1.0
B) 192.168.1.10
C) 192.168.1.255
D) 192.168.0.0
Answer: A) 192.168.1.0
Rationale: With a /24 subnet mask (255.255.255.0), the network portion is the first three octets (192.168.1).
The network address is obtained by performing a bitwise AND between the IP address and the subnet
mask. The network address is 192.168.1.0. The broadcast address is 192.168.1.255.
Question 12: What is the broadcast address for the network 10.0.0.0/8?
A) 10.255.255.255
B) 255.255.255.255
C) 10.0.0.255
D) 10.0.255.255
Answer: A) 10.255.255.255
Rationale: For a /8 subnet mask (255.0.0.0), the network address is 10.0.0.0. The broadcast address is the
last address in the network, which is 10.255.255.255. The broadcast address has all host bits set to 1. This
address is used to send data to all hosts on the local network.
Question 13: Which of the following is a private IP address range?
A) 172.16.0.0 to 172.31.255.255
B) 8.8.8.0 to 8.8.8.255
C) 192.168.1.0 to 192.168.1.255
D) 10.0.0.0 to 10.255.255.255
E) Both A and D
Answer: E) Both A and D
Rationale: Private IP address ranges are defined by RFC 1918: (1) 10.0.0.0 - 10.255.255.255 (/8), (2)
172.16.0.0 - 172.31.255.255 (/12), and (3) 192.168.0.0 - 192.168.255.255 (/16). These addresses are not
