To answer this question, the user needs to be familiar with the IEEE Ethernet designations and the different types of Ethernet cables.

Thicknet is a type of Ethernet cable that has a thicker diameter than other Ethernet cables. It is also known as 10Base5 because it can support Ethernet networks with a maximum data transfer rate of 10 Mbps over a maximum distance of 500 meters.

Now, let's go through each option and determine which one is the correct answer:

A. 10Base5: This option is correct. Thicknet is also known as 10Base5 according to IEEE Ethernet designations.

B. 10BaseT: This option is incorrect. 10BaseT is a type of Ethernet cable that uses twisted-pair wiring and can support Ethernet networks with a maximum data transfer rate of 10 Mbps over a maximum distance of 100 meters.

C. 10Base10: This option is incorrect. 10Base10 is not a valid Ethernet designation.

D. 10Base2: This option is incorrect. 10Base2 is a type of Ethernet cable that uses thin coaxial wiring and can support Ethernet networks with a maximum data transfer rate of 10 Mbps over a maximum distance of 185 meters.

Therefore, the correct answer is:

The Answer is: A. 10Base5

To answer this question, the user needs to have basic knowledge of building construction and architecture. Vertical connectors between floors can be referred to by different names, depending on the context.

A. Spans: This option is incorrect. Spans refer to the distance between two supports, such as beams or columns, which support a load like a floor or roof.

B. Riser: This option is partially correct. A riser is the vertical component of a step in a staircase that connects one level to another. However, it is not the correct term for vertical connectors in general.

C. Lift: This option is also partially correct. In some parts of the world, "lift" is another term for an elevator, which is a form of vertical transportation. However, it is not a comprehensive term for all types of vertical connectors between floors.

The correct answer is: B. Riser.

To solve this question, the user needs to know the difference between WAN and LAN technologies.

A Local Area Network (LAN) is a network that is confined to a small geographic area, such as a single building or a campus. LANs are typically used for connecting computers, printers, and other devices together in an office or home environment. LANs typically use Ethernet or Wi-Fi technology to connect devices together.

A Wide Area Network (WAN), on the other hand, covers a much larger geographic area, such as a city, region, or even a country. WANs are used to connect LANs together over longer distances, and they typically use technologies such as leased lines, satellite links, or microwave links.

Now, let's go through each option and explain why it is right or wrong:

A. True: This option is incorrect. While LAN and WAN are both types of computer networks, they require different technologies to operate. For example, LANs often use Ethernet or Wi-Fi technology, while WANs may use leased lines, satellite links, or microwave links. In addition, WANs often require specialized hardware and software to ensure that data is transmitted quickly and securely over long distances.

B. False: This option is correct. LAN and WAN are both types of computer networks, but they require different technologies to operate. LANs are typically confined to a small geographic area and use Ethernet or Wi-Fi technology, while WANs cover a much larger area and use technologies such as leased lines, satellite links, or microwave links.

The Answer is: B. False

To solve this question, the user needs to know the concept of binary number representation and the parity of numbers.

In binary number representation, each digit can only be 0 or 1. The rightmost digit represents $2^0 = 1$, the second rightmost digit represents $2^1 = 2$, the third rightmost digit represents $2^2 = 4$, and so on. To get the decimal equivalent of a binary number, we add up the values of the digits that have a value of 1.

For the binary number 10111001, the decimal equivalent is:

$1\times2^7 + 0\times2^6 + 1\times2^5 + 1\times2^4 + 1\times2^3 + 0\times2^2 + 0\times2^1 + 1\times2^0$

$= 128 + 0 + 32 + 16 + 8 + 0 + 0 + 1$

$= 185$

To determine if 185 is an odd number, we can check if it is divisible by 2. If it is not divisible by 2, then it is an odd number.

185 is not divisible by 2, therefore it is an odd number.

The Answer is: A