Computer Networks

RJ-11 is the standard 6-pin modular connector used for telephone lines and connecting modems to phone jacks. It typically uses 4 or 6 wires. RJ-45 (option A) is the larger 8-pin connector used for Ethernet networks. RJ-10 doesn't exist as a standard connector type, and COM1 is a serial port designation, not a physical connector type.

getmac is the Windows command that displays the MAC address(es) of network adapters in the system. Options A, B, and C are not valid commands - MAC must be retrieved using getmac or ipconfig /all. The MAC address is the hardware identifier for network interfaces.

The 'net' command suite provides various Windows networking and service commands including net use, net user, net share, net start, etc. netsh (network shell) is more advanced for network config. netstat shows network statistics. 'network' and 'netstat' are not suites like net is.

ARPANET (Advanced Research Projects Agency Network), created by the U.S. Department of Defense in 1969, was the precursor to the modern Internet. It pioneered packet-switching technology and TCP/IP protocols that form the Internet's foundation.

ARPANET (Advanced Research Projects Agency Network), funded by the U.S. Department of Defense, was the precursor to the modern Internet. It pioneered packet switching and TCP/IP protocols in the late 1960s and 1970s, while USENET came later and Ethernet is a local networking technology.

ncpa.cpl (Network Connections Control Panel Applet) opens Windows network connection settings. The name derives from Network Connections Panel Applet. Options A, C, and D are made-up names - only ncpa.cpl is the actual Control Panel file for network connections.

A PowerCenter Domain consists of zero or more Grids. A Grid is a collection of nodes that can run services, and a domain must have at least one node but can have zero grids initially or multiple grids as needed.

A PowerCenter Domain can consist of zero or more grids - grids are the computing resources that execute workflows, and a domain can exist without any grids or contain multiple grids. Options B, C, and D are incorrect because domains are not restricted to having exactly one grid, can have zero grids, and are not required to have at least one grid.

In Half Duplex communication, both parties can transmit and receive signals, but not simultaneously. Only one party can transmit at a time, making the statement true.

IEEE 802.3 is the working group and collection of IEEE standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet. IEEE 802.11 defines Wi-Fi, and IEEE 802.16 defines WiMAX.

In Ab Initio Co>Operating system architecture, the Enterprise Server can have exactly one Gateway Server configured. The Gateway handles client connections and routes requests to the Enterprise Server, and this single-instance architecture prevents routing conflicts and maintains centralized control.

The arp -a command displays the ARP (Address Resolution Protocol) cache, which shows the MAC addresses of network devices that the system has recently communicated with. This is the standard way to view MAC addresses in the ARP table. Options with 'apr' are typos, and -vi is not the correct flag combination for displaying ARP information.

The arp -a command displays the ARP (Address Resolution Protocol) cache, which shows IP-to-MAC address mappings for recently communicated network devices. This is the standard way to view MAC addresses of network interfaces and remote systems. Options B, C, and D have incorrect command syntax or don't exist.

Storage Area Network (SAN) topologies include three main architectures: Point-to-Point (direct connection between two devices), FC Arbitrated Loop (devices connected in a loop sharing bandwidth), and Switched Fabric (devices connected through switches providing dedicated paths). Since all three are valid SAN topologies, 'All the above' is the correct answer.

The linkloop command tests MAC address connectivity between network cards by sending packets with the source MAC set to the destination MAC, testing if the card can receive its own transmissions. It doesn't test router activity, MTU size, or IP-level loopback (ping does that).