Which of the following provide an "always on" Internet access service when connecting to an ISP? Each correct answer represents a complete solution. (Choose two.)
Answer(s): B,D
DSL and Cable modems are used in remote-access WAN technology for connecting to the Internet. Both provide an "always on" Internet access service.Answer options C and A are incorrect. Analog and Digital modems are not always in 'ON' mode when connecting to an ISP. Analog modems transmit analog voice signals, while Digital modems transmit digital signals over a link.
Which of the following types of coaxial cable is used for cable TV and cable modems?
Answer(s): B
RG-59 type of coaxial cable is used for cable TV and cable modems.Answer option D is incorrect. RG-8 coaxial cable is primarily used as a backbone in an Ethernet LAN environment and often connects one wiring closet to another. It is also known as 10Base5 or ThickNet. Answer option A is incorrect. RG-62 coaxial cable is used for ARCNET and automotive radio antennas. Answer option C is incorrect. RG-58 coaxial cable is used for Ethernet networks. It uses baseband signaling and 50-Ohm terminator. It is also known as 10Base2 or ThinNet.
Which of the following fields in the IPv6 header is decremented by 1 for each router that forwards the packet?
Answer(s): D
The hop limit field in the IPv6 header is decremented by 1 for each router that forwards a packet. The packet is discarded when the hop limit field reaches zero.Answer option B is incorrect. Next header is an 8-bit field that specifies the next encapsulated protocol. Answer option A is incorrect. Flow label is a 20-bit field that is used for specifying special router handling from source to destination for a sequence of packets.Answer option C is incorrect. Traffic class is an 8-bit field that specifies the Internet traffic priority delivery value.
Which of the following is a type of computer security that deals with protection against spurious signals emitted by electrical equipment in the system?
Answer(s): C
Emanation security is one of the types of computer security that deals with protection against spurious signals emitted by electrical equipment in the system, such as electromagnetic emission (from displays), visible emission (displays may be visible through windows), and audio emission (sounds from printers, etc). Answer option D is incorrect. Hardware security helps in dealing with the vulnerabilities in the handling of hardware.Answer option B is incorrect. Physical security helps in dealing with protection of computer hardware and associated equipment.Answer option A is incorrect. Communication security helps in dealing with the protection of data and information during transmission.
Which of the following network devices operate at the network layer of the OSI model? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): A,D
A router is a device that routes data packets between computers in different networks. It is used to connect multiple networks, and it determines the path to be taken by each data packet to its destination computer. A router maintains a routing table of the available routes and their conditions. By using this information, along with distance and cost algorithms, the router determines the best path to be taken by the data packets to the destination computer. A router can connect dissimilar networks, such as Ethernet, FDDI, and Token Ring, and route data packets among them. Routers operate at the network layer (layer 3) of the Open Systems Interconnection (OSI) model.A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within a company's network or at a local Internet service provider (ISP) are gateway nodes. In the network for an enterprise, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet. Most of the gateways operate at the application layer, but can operate at the network or session layer of the OSI model.Answer option C is incorrect. A repeater operates only at the physical layer of the OSI model. Answer option B is incorrect. A bridge operates at the data link layer of the OSI model.
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