1. While you are installing an Internet Web server on a client%u2019s network, t
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1. While you are installing an Internet Web server on a client%u2019s network, the owner of the company tells you that she also wants to build a Web server for internal use by the company%u2019s employees. This intranet Web server will not contain confidential information, but it should not be accessible from the company%u2019s Internet Web site. To do this, you create a second site on the Web server. The Internet site uses the well-known port number for Web servers, which is 80. For the intranet site, you select the port number 283. Assuming that the Web server%u2019s IP address on the internal network is 10.54.3.145, what will the users on the company network have to do to access the intranet Web site with Microsoft Internet Explorer?
a. Type http://283:10.54.3.145 in the Address field.
b. Type http://10.54.3.145:283 in the Address field.
c. Type http://10.54.3.145 in the Address field and then specify the port number in the company home page.
d. Configure Internet Explorer to use port 283 in its Options dialog box and then type http://10.54.3.145 in the Address field.
2. A company consists of 30 small offices scattered around the country, each with no more than 5 computers. As the network consultant for the company, you have obtained a Class C network address for them, which you want to use to connect all of the offices to the Internet. To create a separate subnet for each of the offices, what is the minimum number of bits you would have to allocate from the Class C address for a subnet identifier?
a. 3
b. 4
c. 5
d. 6
3. You work for a large corporation that has a Class A network address, which has been subnetted by allocating 6 bits to the subnet address. This allows the corporation to use a different subnet for each of its 50 offices around the world. What subnet mask would you use when configuring a computer on one of these subnets?
a. 255.255.255.252
b. 255.255.252.0
c. 255.252.0.0
d. 252.0.0.0
4. You are a network consultant who has been contracted by an electronics company to upgrade its network. The network is currently running Ethernet on unshielded twisted-pair (UTP) cable. You talk to some of the users and the management, and you learn that the network is experiencing a variety of chronic problems. You suspect that the cause might be the electromagnetic interference generated by the large amount of electronic equipment constantly being assembled and tested throughout the building. Assuming that your suspicion is correct, which of the following steps could you take to eliminate these problems?
a. Replace the UTP cable with fiber optic cable.
b. Replace the Ethernet protocol with Token Ring.
c. Install an uninterruptible power supply (UPS) for the electrical systems causing the interference.
d. Run the cables through the building%u2019s plenums.
Explanation / Answer
1. b. Type http://10.54.3.145:283 in the Address field.
As it is on intranet, a private IP is used which should not be accessable to others. Here, company is using class A private IP.
We should not configure IE because what if the employee has to visit other sites on internet. In that case, employee has to change the port address again and again.
2. C. 5.
A C class can accomodate maximum of 256-2 = 254 hosts. company has 30 offices in the city with maximum 5 hosts in one office. While subnetting, we can only accomodate hosts in multiple of 2s. Allocating 5 of the 8 host bits in a Class C address allows you to create a maximum of 32 (that is, 25) subnets with six (23%u20132) hosts on each subnet. A 3-bit subnet identifier would allow you to create only 8 subnets, and 4 bits would allow only 16. A 6-bit subnet identifier would allow you to create 64 subnets, but each one would support only two hosts each.
3. c. 255.252.0.0
A Class A address has an 8-bit network identifier, and borrowing 6 bits from the host identifier leaves 18. The binary value of the subnet mask would therefore be 11111111 11111100 00000000 00000000, which converts to 255.252.0.0 in decimal form. Answers 1 and 2 are incorrect because they allocate 22 and 14 of the 24 host bits for the subnet identifier, respectively. Answer 4 is incorrect because with 6 host bits, it cannot be a valid Class A address.
4. Replace the UTP cable with fiber optic cable.
because optic cables are immune to electromagnetic interference.
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