CCST Networking Sample Test Questions
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Given below are a few MCQ on CCST Networking:
1. Which of the following OSI model layers defines the physical media used for network communication?
a) Application Layer b) Presentation Layer c) Session Layer d) Physical Layer
Explanation:
The Physical Layer deals with the physical characteristics of the transmission media, such as cables and fiber optics. So the answer is (d).
2. A subnet mask of 255.255.255.128 defines how many usable IP addresses in the subnet?
a) 64 b) 128 c) 254 d) 256
Explanation:
With a subnet mask of 255.255.255.128, the last octet has 2 bits set to 0, which means there are 2^2 = 4 usable IP addresses in the subnet. So the answer is (a).
3. Which of the following protocols is responsible for routing packets across networks?
a) TCP b) UDP c) IP d) ARP
Explanation:
The Internet Protocol (IP) is responsible for routing packets across networks based on their destination IP addresses. So the answer is (c).
4. What is the purpose of using a crossover cable for direct connection between two devices?
a) To connect devices with different speeds b) To connect devices with different media types c) To simplify cable management d) To correct signal transmission direction Explanation:
A crossover cable is used to connect two devices directly when they expect the transmit and receive pins to be reversed. This is often the case for connecting two switches or two computers directly. So the answer is (d).
5. What is the main difference between a router and a switch?
a) Routers operate at Layer 2, while switches operate at Layer 3.
b) Routers connect different networks, while switches connect devices within a network.
c) Routers are more expensive than switches.
d) Routers are less secure than switches.
Explanation:
The primary difference is that routers connect different networks based on IP addresses (Layer 3), while switches connect devices within a network based on MAC addresses (Layer 2). So the answer is (b).
6. Which of the following is NOT a valid IPv4 address format?
a) 192.168.1.1 b) 10.0.0.256 c) 172.16.31.42 d) 225.123.100.78
Explanation:
A valid IPv4 address has four octets ranging from 0 to 255. Option (b) has an octet value greater than 255, making it invalid. So the answer is (b).
7. What is the purpose of using a firewall in a network?
a) To connect devices wirelessly
b) To share files and resources
c) To control network traffic and filter security threats
d) To provide internet access
Explanation:
A firewall is a security system that monitors and controls incoming and outgoing network traffic, acting as a barrier against unauthorized access and malicious attacks. So the answer is (c).
8. What is the function of a DHCP server in a network?
a) To assign unique IP addresses to devices
b) To translate domain names to IP addresses
c) To route packets between networks
d) To connect devices to the internet
Explanation:
A Dynamic Host Configuration Protocol (DHCP) server automatically assigns IP addresses and other network configuration settings to devices on a network. So the answer is (a).
9. What is the difference between TCP and UDP protocols?
a) TCP is faster, while UDP is more reliable.
b) TCP is connection-oriented, while UDP is connectionless.
c) TCP is used for data transfer, while UDP is used for streaming media.
d) TCP is more secure than UDP.
Explanation:
The key difference is that TCP establishes a connection with error checking and retransmission for reliable data delivery, while UDP is connectionless and faster but without error checking, suitable for real-time applications like streaming. So the answer is (b).
10. You are troubleshooting a network connectivity issue between two devices. Which of the following tools would be MOST helpful in diagnosing the problem?
a) Ping b) Traceroute c) Telnet d) SSH
Explanation:
While all the mentioned tools can be useful for network troubleshooting, ping is the most basic and effective tool for diagnosing initial connectivity issues. It sends ICMP echo request packets to the target device and measures the response time, indicating if the device is reachable and responsive.
11. Which command is used to display the routing table on a Cisco router?
a) ping b) show ip route c) tracert d) netstat
Explanation:
The show ip route command displays the routing table on a Cisco router, showing destination networks, subnet masks, next hops, and other routing information. So the answer is (b).
12. What is the purpose of using VLANs in a network?
a) To connect devices wirelessly
b) To segment the network into logical broadcast domains
c) To provide internet access
d) To troubleshoot network connectivity issues
Explanation:
VLANs (Virtual Local Area Networks) logically segment a network into smaller broadcast domains, improving security, traffic management, and performance. So the answer is (b).
13. What is the difference between static and dynamic routing?
a) Static routes are more secure, while dynamic routes are more efficient.
b) Static routes are manually configured, while dynamic routes are learned automatically.
c) Static routes are used for small networks, while dynamic routes are used for large networks.
d) Static routes are slower than dynamic routes.
Explanation:
Static routes are manually configured paths to specific networks, while dynamic routes are learned automatically through routing protocols like RIP or OSPF. So the answer is (b).
14. What is the function of a DNS server in a network?
a) To assign IP addresses to devices
b) To translate domain names to IP addresses
c) To route packets between networks
d) To filter network traffic
Explanation: A Domain Name System (DNS) server translates human-friendly domain names (like <invalid URL removed>) into numerical IP addresses that computers can understand. So the answer is (b).
15. What is the purpose of using NAT (Network Address Translation) in a network?
a) To improve network performance
b) To conserve IP addresses
c) To provide remote access to the network
d) To encrypt network traffic
Explanation: NAT allows a private network to use a limited number of public IP addresses by translating private IP addresses to a single public IP address for internet access. So the answer is (b).
16. What is the difference between IPv4 and IPv6 addressing?
a) IPv4 uses decimal notation, while IPv6 uses hexadecimal notation.
b) IPv4 has a larger address space than IPv6.
c) IPv6 is more secure than IPv4.
d) All of the above.
Explanation: All of the above statements are true. IPv4 uses 32-bit decimal addresses, while IPv6 uses 128-bit hexadecimal addresses, providing a much larger address space and improved security features. So the answer is (d).
17. What is the role of a switch port in a network?
a) To connect devices to the internet
b) To create separate VLANs
c) To define the speed and duplex mode of a connection
d) All of the above.
Explanation: Switch ports connect devices to the network and can be configured for specific settings like speed, duplex mode, and VLAN membership. So the answer is (d).
18. What is the function of a CDP (Cisco Discovery Protocol) packet?
a) To troubleshoot network connectivity issues
b) To exchange device information between neighboring devices
c) To configure network devices remotely
d) To secure network communication
Explanation:
CDP packets are used by Cisco devices to automatically discover and share information about neighboring devices, simplifying network management and troubleshooting. So the answer is (b).
19. What is the difference between full-duplex and half-duplex communication?
a) Full-duplex allows simultaneous transmission and reception, while half-duplex allows only one direction at a time.
b) Full-duplex is faster than half-duplex.
c) Full-duplex is more expensive than half-duplex.
d) All of the above.
Explanation: Full-duplex communication allows devices to transmit and receive data simultaneously, while half-duplex allows data flow in only one direction at a time. Full-duplex is generally faster and more efficient. So the answer is (d).
20. What is the purpose of using SNMP (Simple Network Management Protocol) in a network?
a) To transfer files between devices
b) To monitor and manage network devices remotely
c) To secure network communication
d) To connect devices to the internet
Explanation:
The correct answer is b) To monitor and manage network devices remotely.
21. You are configuring a new wireless router for your home network. Which of the following security protocols is considered the most secure option for Wi-Fi encryption?
a) WEP b) WPA c) WPA2 d) WPA3
Explanation:
While all the listed protocols provide encryption for Wi-Fi networks, WPA3 (Wi-Fi Protected Access 3) is the most recent and secure option. It offers improved security features like stronger encryption algorithms, enhanced authentication protocols, and protection against brute-force attacks compared to its predecessors.