Computer Knowledge
Computer Networks
2,461 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
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ifconfig
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lanscan
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arp
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traceroute
C
Correct answer
Explanation
The Address Resolution Protocol (arp) command displays and modifies the translation tables used to map Internet IP addresses to physical Ethernet MAC addresses.
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nslookup
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ping
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lanscan
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arp
C
Correct answer
Explanation
The lanscan command (HP-UX) displays the status of network interface cards, showing whether each NIC is up or down. nslookup queries DNS, ping tests connectivity, and arp shows MAC-to-IP mappings.
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gethostbyname
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hostname
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nsquery
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whois
C
Correct answer
Explanation
The nsquery command on HP-UX is used to query the name service switch configuration to resolve hostnames and verify that DNS/BIND resolution is working properly.
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netstat
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nwmgr
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lanscan
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ifconfig
A
Correct answer
Explanation
The netstat command with the -r option is used to display the kernel routing tables on UNIX and Linux systems, showing how network packets are routed.
C
Correct answer
Explanation
Neighbor Discovery Protocol (NDP) is a core component of IPv6 that replaces ARP in IPv4 networks. It handles address resolution, neighbor unreachability detection, and duplicate address detection. DHCP is for configuration, ARP is IPv4-specific, and OSPF is a routing protocol.
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SSH-2
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SSH-3
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SSH-AES
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OpenSSH3
A
Correct answer
Explanation
HP-UX Secure Shell defaults to the SSH-2 protocol, which is much more secure and robust than the older, deprecated SSH-1 protocol.
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whois
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uname
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nsquery
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hostname
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gethostname
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ncreasing throughput on the network interface
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binding the same IP address to multiple network interface
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binding more than one IP address to a single network interface
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binding more than one MAC address to a single network interface
C
Correct answer
Explanation
IP multiplexing (or IP aliasing) on a UNIX host refers to assigning and binding multiple IP addresses to a single physical network interface card.
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creates extensive logs
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supports X.25 Interfaces
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installed and enabled by default
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provides a new GUI configuration tool
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supports Network Address Translation (NAT)
A,B,E
Correct answer
Explanation
IPFilter on HP-UX 11i v3 creates extensive logs for auditing, supports legacy X.25 interfaces (important for enterprise networks), and provides Network Address Translation (NAT) capabilities. It is not installed/enabled by default (requires setup), and the configuration is primarily text-based through ipf rules files, not a GUI tool.
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arp
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lanscan
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ifconfig
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traceroute
A
Correct answer
Explanation
The arp command is used to display and manipulate the Address Resolution Protocol (ARP) cache, which maps IP addresses (Internet) to physical MAC addresses (Ethernet).
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integrated security
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asynchronous write support
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integrated file locking support
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simplified firewall configuration
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support for the UDP network transport
A,C,D
Correct answer
Explanation
NFS version 4 introduces strong integrated security (via Kerberos), integrated file locking (eliminating NLM), and operates over a single TCP port (2049), which greatly simplifies firewall configuration.
D
Correct answer
Explanation
Apache HTTP Server listens on port 80 by default for HTTP connections. This is the standard well-known port for unencrypted web traffic. Port 8080 is commonly used as an alternate port, port 25 is for SMTP, and port 83 is not a standard service port.
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Handles IMAP e-mail protocols for Apache.
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Performs image map handling.
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Allows for shared inter-module memory protocols.
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There is no mod_imap Module which is available for Apache.
B
Correct answer
Explanation
The mod_imap module handles server-side image maps (clickable regions in images for navigation), not the IMAP email protocol. Despite the confusing name, it's for image map processing.
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Internet Relay Channel
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Internet Respond Channel
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Internet Relay Chat
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Internet Response Cache
C
Correct answer
Explanation
IRC stands for Internet Relay Chat, a protocol for real-time text messaging communication. It enables users to join channels (chat rooms) or send private messages. IRC predates modern instant messaging and was foundational to online chat culture. It's 'Relay Chat', not 'Relay Channel'.
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74.125.127.100
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69.72.169.241
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192.168.1.100
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209.131.36.100
C
Correct answer
Explanation
Private IP addresses for local networks are defined in RFC 1918. 192.168.0.0/16 is one such range, making 192.168.1.100 a valid local network address. The other options are public IP addresses - 74.125.127.100 belongs to Google, 69.72.169.241 is also public, and 209.131.36.100 is a Yahoo address.