Computer Knowledge
Computer Networks
2,614 Questions
Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.
OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands
Computer Networks Questions
A
Correct answer
Explanation
HTTPS (HTTP Secure) uses TLS/SSL to encrypt traffic and operates over TCP port 443.
C
Correct answer
Explanation
DNS (Domain Name System) uses port 53 for both UDP and TCP communications.
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Destination MAC
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Destination IP
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Source MAC
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Source IP
A
Correct answer
Explanation
ARP (Address Resolution Protocol) is used to map a known destination IP address to its corresponding physical MAC address on the local network segment.
D
Correct answer
Explanation
ARP operates between the Data Link (Layer 2) and Network (Layer 3) layers, but it is generally considered a Layer 2 protocol because it facilitates the delivery of frames.
B
Correct answer
Explanation
The first byte of an IPv4 header contains the Version (4 bits) and the IHL (Internet Header Length, 4 bits). A standard header with no options has an IHL of 5 (5 * 4 bytes = 20 bytes). Thus, the byte is 0x45.
B
Correct answer
Explanation
The IHL (Internet Header Length) field in an IPv4 header indicates the number of 32-bit words. A standard header without options is 20 bytes, which equals 5 words.
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Destination IP then Source IP
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Source MAC then Destination MAC
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Destination MAC then Source MAC
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Source IP then Destination IP
C
Correct answer
Explanation
In an Ethernet II frame header, the first 6 bytes are the Destination MAC address, followed by the next 6 bytes which are the Source MAC address.
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MAC and ODP
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LLC and PPP
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LDP and MAC
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LLC and MAC
D
Correct answer
Explanation
The Data Link Layer (Layer 2 of the OSI model) is divided into two sub-layers: the Logical Link Control (LLC) sub-layer and the Media Access Control (MAC) sub-layer.
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0x0800
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0x0806
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0x86DD
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0x8100
C
Correct answer
Explanation
The Ethertype value 0x86DD is assigned to identify IPv6 packets within an Ethernet frame.
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0x0800
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0x0806
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0x86DD
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0x8100
A
Correct answer
Explanation
The Ethertype value 0x0800 is the standard identifier for IPv4 packets in an Ethernet frame.
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IPsec protocol suite
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Secure Sockets Layer
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Message Digest 5
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Secure Hash Algorithm 1
A
Correct answer
Explanation
IPsec is a suite of protocols designed to provide security at the network layer, including confidentiality through encryption. SSL/TLS operates at the transport/application layer, while MD5 and SHA-1 are hashing algorithms, not encryption protocols.
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Host names and IP addresses
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Whois information
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DNS server locations
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Name server types and operating systems
A
Correct answer
Explanation
Nslookup is a network administration tool used to query the Domain Name System (DNS) to obtain domain name or IP address mapping.
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network protocol analysis
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network connection security
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connection analysis
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defending malicious packet-filtering
A
Correct answer
Explanation
Wireshark is a widely used network protocol analyzer. It allows users to capture and interactively browse the traffic running on a computer network.
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SYN stealth scan
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TCP connect
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XMAS tree scan
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ACK scan
A
Correct answer
Explanation
A SYN stealth scan (half-open scan) sends a SYN packet to the target. If a SYN/ACK is received, the port is open, but the scanner sends an RST packet instead of completing the handshake, thus avoiding a full connection.
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Network Mapping
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Network Management
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Network Mapper
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Network Monitoring
C
Correct answer
Explanation
Nmap stands for Network Mapper. It is a free and open-source utility for network discovery and security auditing.