Archives

The counterpart of fragmentation is reassembly. Answer: The greater the bandwidth of the signal the greater its information carrying capacity. Answer: T The most prominent specification for wireless LANs was developed by the IEEE 802.3 working group. Answer: F Amplitude […]

Twisted pair may only be used to transmit analog and digital signals. Answer: An individual cell of an IR LAN is limited to a single room because infrared light does not penetrate opaque walls. Answer: T Second generation cellular networks […]

________ schemes can be categorized based on a number of factors, such as: what criterion is used to determine the best route between two nodes, what strategy is used for obtaining information needed to determine route, and whether a distributed […]

VoIP is the transmission of speech across IP-based network. Answer: The selection of a route is generally based on some performance criterion. Answer: T Analog data must be converted to digital before transmission for packet switching. Answer: T When there […]

In ________ modulation, each signal occupies a distinct frequency band so these signals can be combined by simple addition to produce the composite signal for transmission. Answer: The data, plus preamble, postamble and control information are called a ________. Answer: […]

Transmission is generally in the form of frames when using a ring topology. Answer: Effective and efficient data communication and networking facilities are vital to any enterprise. Answer: T FTP provides a basic electronic mail transport facility. Answer: F Rapid […]

The primary function of a gateway is to relay data from one network to the other on its route from the source to the destination end system. Answer: ________ consists of three subfields: user priority, canonical format indicator and VLAN […]

Currently wireless LAN products fall into three categories: spread spectrum LANs, OFDM LANs and ________ LANs. Answer: The most important data link control protocol is ________. Answer: high level data link control (HDLC) A receiver joins a multicast group by […]

The ________ is designed for use between local area networks that use identical protocols for the physical and link layers and, because the devices all use the same protocols, the amount of processing here is minimal. Answer: In the ________ […]

A ________ is a server that appears to the client as if it were an origin server. A) tunnel B) proxy C) gateway D) all of the above Answer: If the ________ has to do with the ability of the […]

Congestion control is concerned with efficient use of a network at high load. Answer: Because the least-cost criterion is more flexible, it is more common than the minimum-hop criterion. Answer: F A modem is required to establish communication between a […]

When a TCP entity retransmits a segment using fast retransmit it assumes that a segment was lost, even though it has not yet timed out on that segment. Answer: The key technology for 4G systems is ________. Answer: Orthogonal Frequency […]

Minimal encapsulation results in less overhead and can be used if the mobile node, home agent, and foreign agent all agree to do so. Answer: Whereas traditional telephone networks allocate dedicated circuits for voice communications using circuit switching, VoIP uses […]

A protocol is concerned with exchanging data between two entities. Answer: In 1994 the Internet Architecture Board issued a report titled “Security in the Internet Architecture” that stated that the general consensus was that the Internet was secure and there […]

The disadvantage of fixed routing is ________. A) its lack of flexibility B) its simplicity C) it does not work with virtual circuits D) it does not work with datagrams Answer: ________ is used on the uplink channel to provide […]

In a rate based scheme any node along the path of the connection can reduce the data rate limit in a control message to the source. Answer: If dynamic or alternate routing is used the potential exists for a datagram […]

When the mobile node moves its attachment point to another network, that network is considered a foreign network for this host. Answer: Priority could be assigned on a message basis or on a connection basis. Answer: T Some e-mail systems […]

Correction of errors using an error detecting code requires that block of data to be ________. A) skipped over B) deleted C) retransmitted D) streamed Answer: The term ________ means that all users share a common MAC broadcast address. A) […]

The IEEE 802.11 services include managing associations, delivering data, and ________. Answer: The m * n matrix H = [hij] is called the _______ . Answer: parity check matrix Diverse multipath fading offers multiple views of the transmitted data at […]

Traffic on a network or internet can be divided into two broad categories: elastic and inelastic. Answer: One of the things that may happen when network congestion occurs is packets are discarded. Answer: T SIP is based on an HTTP-like […]

The ________ field in the TCP header contains the sequence number of the next data octet that the TCP entity expects to receive. Answer: Real-time traffic is an example of ________ traffic. Answer: inelastic In a data transmission system the […]

One of the benefits of MPLS is that it does not need to retain the flexibility of an IP-based networking approach Answer: Networks that generally cover a large geographical area, require the crossing of public right-of-ways, consist of a number […]