Computer Science

Option: A
Explanation :Network Control Protocol is used to help identify the Network layer protocol used in the packet.
Network Control Protocol (NCP) is a set of protocols forming a part of Point − to − Point Protocol (PPP). PPP is a data link layer protocol that is used to transmit multiprotocol data between two directly connected (point-to-point) computers. PPP is composed of link control protocol (LCP), authentication protocol (AP) and network control protocol (NCP). NCPs are used for negotiating the parameters and facilities for the network layer. For every higher-layer protocol supported by PPP, one NCP is there.

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Option: D
Explanation :The command copy flash tftp will prompt you to back up an existing IOS in flash to a TFTP host.

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Option: D
Explanation :802.11 Applies to wireless LANs and provides 1 or 2 Mbps transmission in the 2.4 GHz band using either frequency hopping spread spectrum (FHSS) or direct sequence spread spectrum (DSSS).
802.11a An extension to 802.11 that applies to wireless LANs and provides up to 54-Mbps in the 5GHz band. 802.11a uses an orthogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS.
802.11b Also referred to as 802.11 High Rate or Wi-Fi, is an extension to 802.11 that applies to wireless LANS and provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1-Mbps) in the 2.4 GHz band. 802.11b uses only DSSS.
802.11e A wireless draft standard that defines the Quality of Service (QoS) support for LANs, and is an enhancement to the 802.11a and 802.11b wireless LAN (WLAN) specifications.
802.11g Applies to wireless LANs and is used for transmission over short distances at up to 54-Mbps in the 2.4 GHz bands.

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Option: B
Explanation :The command to back up the configuration on a router is copy running-config startup-config.

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Option: C
Explanation :ACLs are a network filter utilized by routers and some switches to permit and restrict data flows into and out of network interfaces. When an ACL is configured on an interface, the network device analyzes data passing through the interface, compares it to the criteria described in the ACL, and either permits the data to flow or prohibits it.
On Cisco routers, there are two main types: standard and extended. These two types are the most widely used ACLs.

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Option: A
Explanation :A computer network is a set of connected computers. Computers on a network are called nodes. The connection between computers can be done via cabling, most commonly the Ethernet cable, or wirelessly through radio waves. Connected computers can share resources, like access to the Internet, printers, file servers, and others. A network is a multipurpose connection, which allows a single computer to do more.

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Option: B
Explanation :A distributed system is a network that consists of autonomous computers that are connected using a distribution middleware. They help in sharing different resources and capabilities to provide users with a single and integrated coherent network.
A distributed system consists of computers that are not only connected but coordinate among each other to form a single system. That distributed system then provides one or more services to other machines outside the system, without those clients needing to know or care about which machine within the distributed system performs a particular role or holds a particular piece of data.

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Option: A
Explanation :Physical layer is a layer 1 device which deals with network cables or the standards in use like connectors, pins, electric current used etc. Basically the transmission speed is determined by the cables and connectors used. Hence it is physical layer that determines the transmission speed in network.

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Option: B
Explanation :A port address in TCP/IP is 16 bits in length. In the TCP/IP protocol suite, the port numbers are integers between 0 and 65,535.
Port Address is also called a port number is the logical address of each application or process that uses a network or the Internet to communicate. A port number uniquely identifies a network-based application on a computer.

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Option: C
Explanation :In the TCP/IP architecture, the label assigned to a process is called a port address. A port address in TCP/IP is 16 bits in length.
Port Address is also called a port number is the logical address of each application or process that uses a network or the Internet to communicate. A port number uniquely identifies a network-based application on a computer.

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