Write the Answer as True/False of the following. Q1: The older versions of Ether
ID: 3781268 • Letter: W
Question
Write the Answer as True/False of the following.
Q1: The older versions of Ethernet have remained compatible with newer versions due to the frame format which has remained constant.
True/False
Q2. An Ethernet frame consists of a fixed-length header
True/False
Q3. The header in an Ethernet frame provides multiplexing and demultiplexing
True/False
Q4.In the internet downstream is higher than the upstream
True/False
Q5.ISDN stands for Internet Services Dynamic Network
True/False
Q6.The thick net medium consisted of a thin coaxial cable
True/False
Q7.Hub is used in Twisted pair Ethernet.
True/False
Q8. Logically twisted pair Ethernet employs a bus topology, but physically twisted pair Ethernet forms a star-shaped topology
True/False
Q9. Higher-speed Ethernet technologies use an electronic device known as a Hub rather than a switch.
True/False
Q10.In cellular communication system the appropriate cell shape is circle
True/False
Explanation / Answer
1. The older versions of Ethernet have remained compatible with newer versions due to the frame format which has remained constant.
True.
Frame format has remained constant since DIX standard was created in the 1970s
2. An Ethernet frame consists of a fixed-length header
True
An Ethernet frame consists of a fixed-length header, variable length payload and fixed-length CRC.
3. The header in an Ethernet frame provides multiplexing and demultiplexing
False
The type field in an Ethernet frame provides multiplexing and demultiplexing that allows a given computer to have multiple protocols operating simultaneously
4. In the internet downstream is higher than the upstream
False.
Not false exactly. Cable modems use frequencies to transmit data. A cable modem typically uses a 6Mhz wide frequency for the downstream. At 256QAM this allows for 42 Mbps /w 4Mbps for docsis overhead. You get ~160Mbps downstream bandwidth on a modem that bonds four channels using docsis3.0.
On the other hand the upstream is typically limited to QPSK,16QAM, or 64QAM in some cases. The older Docsis standards 1.0/1.1 have a max upstream frequency width of 3.2Mhz. At 16QAM on a 3.2MHZ channel you get ~10Mbps on that upstream channel. That is 25% of what the Downstream is capable.
Docsis2.0/3.0 allow for 6.4Mhz on the upstream. This doubles the bandwidth for that channel but also takes up twice the frequency space.
The reason they do not use 256QAM on the upstream is because there is so much noise on the lower frequencies. Upstream is typically reserved at 5-42, but 20-40 is usually the only usable due to noise issues.
20-40Mhz leaves 6 frequencies at 3.2Mhz at 16QAM so a max of 60Mbps. DS can use 50-1000+MHZ so you have an huge amount of space to work with. Cable Operators that provide RF-TV have to share the bandwidth between their analog and digital offerings though.
5. ISDN stands for Internet Services Dynamic Network
False
ISDN stands for Integrated Services Digital Network
6.The thick net medium consisted of a thin coaxial cable
False.
Thicknet cable is a relatively rigid coaxial cable about 1.27 centimeters (0.5 inches) in diameter. Figure 2.5 shows the difference between thinnet and thicknet cable. Thicknet cable is sometimes referred to as Standard Ethernet because it was the first type of cable used with the popular network architecture Ethernet. Thicknet cable's copper core is thicker than a thinnet cable core.
7. Hub is used in Twisted pair Ethernet.
True
A 10BASE-T or 100BASE-TX node such as a PC uses a connector wiring called medium dependent interfaces (MDI), transmitting on pin 1 and 2 and receiving on pin 3 and 6 to a network device. An infrastructure node (a hub or a switch) accordingly uses a connector wiring called MDI-X, transmitting on pin 3 and 6 and receiving on pin 1 and 2. These ports are connected using a "straight-through" cable, so each transmitter talks to the receiver on the other side.
8. Logically twisted pair Ethernet employs a bus topology, but physically twisted pair Ethernet forms a star-shaped topology
True
9. Higher-speed Ethernet technologies use an electronic device known as a Hub rather than a switch.
True.
•Higher-speed Ethernet technologies use an electronic device known as a switch rather than a hub
•To remain backward compatible
–standards for the higher-speed versions specify that interfaces automatically sense the speed at which a connection can operate
–and slow down to accommodate older devices
10. In cellular communication system the appropriate cell shape is circle
False.
appropriate cell shape is hexagon
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