MCQs on Networking Fundamentals | CCNA Certification MCQs
Understanding networking fundamentals is essential for anyone preparing for networking certifications. It covers topics such as the OSI and TCP/IP models, IP addressing, subnetting, and common networking devices. The concepts of IPv4, IPv6, and network topologies like LAN, WAN, and MAN are key to building a solid foundation in networking.
OSI Model and TCP/IP Model
- In the OSI model, which layer is responsible for error detection and correction?
a) Transport
b) Data Link
c) Network
d) Physical - Which layer of the OSI model is responsible for end-to-end communication and data flow control?
a) Application
b) Transport
c) Network
d) Session - What is the main difference between the OSI model and the TCP/IP model?
a) OSI has seven layers, TCP/IP has five layers
b) OSI is theoretical, TCP/IP is practical
c) OSI model supports only IPv6
d) TCP/IP does not use the Transport layer - Which layer of the TCP/IP model is responsible for routing?
a) Application
b) Transport
c) Internet
d) Network Access - At which layer of the OSI model does IP addressing operate?
a) Transport
b) Network
c) Data Link
d) Application - The OSI model’s Presentation layer is responsible for which of the following?
a) Data encryption and compression
b) Error handling
c) Packet forwarding
d) Session management - Which of the following models was developed first, OSI or TCP/IP?
a) OSI
b) TCP/IP
c) Both were developed simultaneously
d) Neither - Which of the following is true about the Transport layer in the OSI model?
a) It is responsible for packet switching
b) It establishes, maintains, and terminates connections
c) It deals with logical addressing
d) It handles network routing - In the OSI model, which layer is responsible for establishing, managing, and terminating communication sessions?
a) Transport
b) Session
c) Network
d) Data Link - The TCP/IP model is based on which two layers of the OSI model?
a) Network and Physical
b) Application and Transport
c) Network and Transport
d) Data Link and Application
IP Addressing and Subnetting
- What is the default subnet mask for a Class A IP address?
a) 255.255.0.0
b) 255.255.255.0
c) 255.255.255.255
d) 255.0.0.0 - How many hosts can a subnet with a subnet mask of 255.255.255.0 support?
a) 254
b) 256
c) 512
d) 128 - Which of the following is a valid IPv4 address?
a) 192.168.256.1
b) 10.10.10.10
c) 256.256.256.256
d) 172.300.0.0 - What is the network address of the subnet 192.168.1.128/25?
a) 192.168.1.128
b) 192.168.1.0
c) 192.168.1.64
d) 192.168.1.127 - Which of the following is the purpose of subnetting?
a) To divide a large network into smaller, more manageable networks
b) To combine multiple networks into a single network
c) To increase the IP address range
d) To prevent the need for routing - What is the maximum number of subnets you can have with a /27 subnet mask?
a) 8
b) 16
c) 32
d) 64 - Which of the following CIDR notations corresponds to the subnet mask 255.255.255.0?
a) /24
b) /16
c) /8
d) /32 - What is the primary purpose of a subnet mask?
a) To define the IP address range
b) To specify the network’s DNS server
c) To specify the default gateway
d) To identify the network and host portion of an IP address - What does the term “CIDR” stand for?
a) Classless Internet Domain Routing
b) Classless Inter-Domain Routing
c) Classed Internet Domain Routing
d) Class Inter-Domain Routing - Which subnet mask would be used to provide 30 usable host IP addresses?
a) 255.255.255.240
b) 255.255.255.128
c) 255.255.255.248
d) 255.255.255.192
IPv4 and IPv6 Addressing
- How many bits are used in an IPv4 address?
a) 64
b) 128
c) 32
d) 256 - Which of the following is a valid IPv6 address?
a) 192.168.1.1
b) 10.0.0.1
c) 2001:0db8:85a3:0000:0000:8a2e:0370:7334
d) 256.256.256.256 - What is the primary advantage of IPv6 over IPv4?
a) More efficient routing
b) Larger address space
c) Easier configuration
d) Faster data transfer rates - Which of the following is a valid method for an IPv6 address to be abbreviated?
a) Remove leading zeros in each block
b) Remove all zeros
c) Replace colons with hyphens
d) Remove the first byte - What is the maximum number of IPv6 addresses available per device?
a) 2^32
b) 2^128
c) 2^64
d) 2^256 - Which of the following IPv4 address classes is used for private networks?
a) Class A
b) Class B
c) Class C
d) Class D - What does an IPv6 address consist of?
a) 8 blocks of 4 hexadecimal digits
b) 8 blocks of 8 decimal digits
c) 4 blocks of 8 binary digits
d) 2 blocks of 16 binary digits - What is the range of a Class C IPv4 address?
a) 0.0.0.0 to 127.255.255.255
b) 128.0.0.0 to 191.255.255.255
c) 192.0.0.0 to 223.255.255.255
d) 224.0.0.0 to 239.255.255.255 - Which IPv6 address type is used for communication between nodes on the same link?
a) Global Unicast Address
b) Link-Local Address
c) Multicast Address
d) Anycast Address - Which command is used to find your device’s IPv6 address on a Windows system?
a) ipconfig
b) ifconfig
c) netstat
d) traceroute
Subnet Masks and CIDR Notation
- What is the CIDR notation for a subnet mask of 255.255.252.0?
a) /22
b) /24
c) /26
d) /30 - How many IP addresses are available in a /28 network?
a) 16
b) 30
c) 32
d) 64 - What is the main purpose of CIDR notation?
a) To simplify routing
b) To configure network devices
c) To assign private IP addresses
d) To calculate subnet masks - What is the maximum number of usable IP addresses in a /30 subnet?
a) 4
b) 2
c) 6
d) 8 - In CIDR notation, how many addresses are available in a /29 subnet?
a) 4
b) 6
c) 8
d) 32 - What does the subnet mask 255.255.255.192 represent in CIDR notation?
a) /24
b) /26
c) /28
d) /30 - Which of the following is the correct subnet mask for a /24 network?
a) 255.255.0.0
b) 255.255.255.0
c) 255.255.255.255
d) 255.255.255.128 - What is the purpose of the subnet mask in networking?
a) To identify the device’s MAC address
b) To define the range of IP addresses for a network
c) To encrypt the data packets
d) To assign IP addresses dynamically - Which of the following is a private IP range for Class A addresses?
a) 192.168.0.0 to 192.168.255.255
b) 10.0.0.0 to 10.255.255.255
c) 172.16.0.0 to 172.31.255.255
d) 224.0.0.0 to 239.255.255.255 - What is the default subnet mask for a Class B address?
a) 255.255.0.0
b) 255.255.255.0
c) 255.0.0.0
d) 255.255.255.255
Answers
| Qno | Answer |
|---|---|
| 1 | b) Data Link |
| 2 | b) Transport |
| 3 | b) OSI is theoretical, TCP/IP is practical |
| 4 | c) Internet |
| 5 | b) Network |
| 6 | a) Data encryption and compression |
| 7 | a) OSI |
| 8 | b) It establishes, maintains, and terminates connections |
| 9 | b) Session |
| 10 | b) Application and Transport |
| 11 | d) 255.0.0.0 |
| 12 | a) 254 |
| 13 | b) 10.10.10.10 |
| 14 | b) 192.168.1.0 |
| 15 | a) To divide a large network into smaller, more manageable networks |
| 16 | b) 16 |
| 17 | a) /24 |
| 18 | d) To identify the network and host portion of an IP address |
| 19 | b) Classless Inter-Domain Routing |
| 20 | a) 255.255.255.240 |
| 21 | c) 32 |
| 22 | c) 2001:0db8:85a3:0000:0000:8a2e:0370:7334 |
| 23 | b) Larger address space |
| 24 | a) Remove leading zeros in each block |
| 25 | b) 2^128 |
| 26 | b) Class B |
| 27 | a) 8 blocks of 4 hexadecimal digits |
| 28 | c) 192.0.0.0 to 223.255.255.255 |
| 29 | b) Link-Local Address |
| 30 | a) ipconfig |
| 31 | a) /22 |
| 32 | b) 30 |
| 33 | a) To simplify routing |
| 34 | b) 2 |
| 35 | b) 6 |
| 36 | b) /26 |
| 37 | b) 255.255.255.0 |
| 38 | b) To define the range of IP addresses for a network |
| 39 | b) 10.0.0.0 to 10.255.255.255 |
| 40 | a) 255.255.0.0 |