The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is None of these 31000 bps 9600 bps 6200 bps 34000 bps TRUE ANSWER : ? YOUR ANSWER : ?
In cyclic redundancy checking, the divisor is _____ the CRC. two bits more None of these one bit more than the same size as one bit less than TRUE ANSWER : ? YOUR ANSWER : ?
What function does a serial interface perform in data communication? None of these Converts serial data into audio signals Converts parallel data into a stream of bits Converts analog signals into digital signals Decodes incoming signals into computer data TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following services use UDP?1. DHCP2. SMTP3. SNMP4. FTP5. HTTP6. TFTP 1, 3 and 6 All of these 1, 2 and 4 2 and 4 TRUE ANSWER : ? YOUR ANSWER : ?
A network designer wants to connect 5 routers as point-to-point simplex line. Then the total number of lines required would be 5 None of these 10 20 32 TRUE ANSWER : ? YOUR ANSWER : ?
What frequency range is used for FM radio transmission? Very High Frequency : 30 MHz to 300 MHz Very Low Frequency : 3 kHz to 30. kHz High Frequency : 3 MHz to 30 MHz Low Frequency : 30 kHz to 300 kHz None of these TRUE ANSWER : ? YOUR ANSWER : ?
To configure the VLAN trunking protocol to communicate VLAN information between two switches, what two requirements must be met?1. Each end of the trunk link must be set to the IEEE 802.1e encapsulation.2. The VTP management domain name of both switches must be set the same.3. All ports on both the switches must be set as access ports.4. One of the two switches must be configured as a VTP server.5. A rollover cable is required to connect the two switches together.6. A router must be used to forward VTP traffic between VLANs. 1, 2 and 4 2 and 4 3, 5 and 6 1 and 6 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following refers to the terms "residual error rate"? The probability that one or more errors will be undetected when an error detection scheme is used the number of bit errors per twenty four hours of continuous operation on an asynchronous line signal to noise ratio divided by the ratio of energy per bit to noise per hertz None of these the probability that one or more errors will be detected when an error detection mechanism is used TRUE ANSWER : ? YOUR ANSWER : ?
The CCITT Recommendation X.25 specifies three layers of communications: None of these physical datalink and network application, presentation and session Session, transport and network datalink, network and transport TRUE ANSWER : ? YOUR ANSWER : ?
Which network has connectivity range up to 10 meters? MAN PAN WAN LAN TRUE ANSWER : ? YOUR ANSWER : ?