A graphics-intensive website has been developed for your big
company. The
anticipated number of hits per day are expected to be at least 25,000, with about
25 concurrent users at any given time. This amount is not expected to grow at
any time in the near future. John, the webmaster of the company has
been told that an ISDN line is necessary to support this site. He pulls out a
chart that states that ISDN should support up to approximately 32,000 hits per
day. Do you agree with John? If not, what type of connection type would
you recommend?
A. Yes, an ISDN line should support the requirements.
B. No, an ISDN line is overkill. A 56K Frame Relay would be more efficient.
C. No, an ISDN could not support the traffic. A T1 line would be more
appropriate.
D. No, an ISDN could not support the traffic. A T3 line would be more
appropriate.
E. No, an ISDN could not support the traffic. A 10MB Ethernet would be more
appropriate.
Answer: C - You are expecting 25 concurrent users at any one time. Presuming
that all 25 users are using, at minimum, 56K modems ( A 56K modem
has a theoretical maximum speed of 57,600 or 56 Kbps [Kilobits Per Second] ), you will have insufficient
bandwidth with an ISDN line.
Total bandwidth = number of concurrent connections at a given bandwidth * the
given bandwidth
1,440,000 bps = 25 * 57,600bps (presuming the clients are using at minimum a 56K
modem)
ISDN supports 128,000 bps; T1 supports 1.5Mbps.
Under what circumstances can a user have both
Internet Explorer 6.0 and Netscape 7.0 installed on their system?
A. At any time. As compatible programs, there is no problem.
B. On a special install, when specified during the IE 6.0 installation process
C. When the system is configured as a dual boot system only.
D. Never. During the install process, IE 6.0 overwrites any Netscape files on
the system.
Answer: A
3.
You have implemented SSL [ Short for Secure
Sockets Layer ]and obtained a certificate for your
server. Your web page, containing sensitive information, must be accessed using
https://sensitive.system.com.
However, within a day of activating your site, the sensitive information has
been leaked to the press. What has gone wrong?
A. An employee with access to the page has downloaded the information and leaked
it.
B. An employee with the competition has accessed the page using https:// and
leaked the information.
C. The information was transmitted in an algorithm that was easily decrypted.
D. 128-bit security is only available in North America. The encryption failed.
Answer: B - Enabling SSL on your server only
ensures that a secure channel is opened between the client and the server. In
order to restrict access to the page, another security measure should also be
implemented, such as NTFS Challenge Response or Client Certificates. Because
only a certificate was issued for your server and no other security measures
were in place, a clever member of the competition tried entering
https://sensitive.system.com
and was able to access the information.
How SSL Works:
SSL is a protocol developed by Netscape for transmitting private documents
via the Internet. SSL works by using a private key to encrypt data that's
transferred over the SSL connection. Both Netscape Navigator and Internet
Explorer support SSL, and many Web sites use the protocol to obtain confidential
user information, such as credit card numbers. By convention, URLs that require
an SSL connection start with https: instead of http:.
References: |
How SSL Works |
4.
Which organization is responsible for Internet standards?
Workers at your company are complaining that there is no
incoming mail. You check with your co-workers, and they're able to surf the Web
and send mail out. Given this, the most likely cause is:
A. The ISP's DHCP server is not functioning.
B. The ISP's Mac server is down.
C. The ISP's POP3 server has failed.
D. The ISP's SMTP server is out to lunch.
Answer: C - In larger sites, different servers frequently support mail. Keep in
mind that TCP/IP mail protocols use different port numbers. Because the failure
is with the incoming mail only, a reasonable conclusion would be that the
service on port 110 is not functioning. |
POP3 |
8.
What performance issues are a Web Server susceptible to?
A. Too little RAM
B. A slow CPU
C. Over-taxed storage controller and devices
D. Congested network connections
E. Limited number of files in root directory
Answer(s): A, B, C, D - Root directory file limitation is not a performance
issue but a capabilities issue. In addition, it applies only to the actual root
of a FAT volume and not to the roots of NTFS volumes or Web roots hosted on
either FAT or NTFS volumes when that Web root is not mapped to the drive root.
9.
What layer of the
OSI model would be concerned with network applications such
as Telnet and FTP?
A. The Application layer
B. The Program layer
C. The Session Layer
D. The Network layer
E. The TCP/IP layer
Answer: A
10.
Where should anti-virus software be installed other than the
server? [Choose the three best answers]
A. Client machine
B. Proxy server
C. Router
D. DHCP server
Answer: A, B, D - Generally, anti-virus software should be installed on any
machine that can run an executable program (.exE.. Routers do not run
executables.
11.
Which of the following image formats requires a plug-in to be
installed on the client's browser?
A. TIFF
B. GIF
C. JPEG
D. PNG
Answer: A - Most Web browsers support GIF, JPEG, and PNG file formats by
default. The TIFF format does require a plug-in.
12.
Given the choices below, which would best be described as a
Class C address range?
Given the choices below, what would you use to reset a modem?
A. AT?
B. ATDT
C. ATZ
D. ATH
Answer: C - This is among one of many of the command sets predetermined by the
AT command set. ATDT issues the command dial with touch tone, whereas ATH issues
the command to hang up the line. References:
|
Modem Command Set |
14.
Regardless of what the user does, he cannot find a Web site
either by IP address or friendly name. What is the most likely source of the
issue?
A. The MAC address
B. Misconfigured browser
C. DNS error
D. Firewall configuration error
Answer: D - Because of the complexity of firewalls, they are easy to mis-configure.
A firewall is a set of related programs, located at a network gateway server,
that protects the resources of a private network from users from other networks.
Basically, a firewall, working closely with a router program, filters all
network packets to determine whether to forward them toward their destination. A
firewall is often installed away from the rest of the network so that no
incoming request can get directly at private network resources. There are a
number of firewall screening methods. A simple one is to screen requests to make
sure they come from acceptable (previously identified) domain names and IP
addresses. For mobile users, firewalls allow remote access in to the private
network by the use of secure logon procedures and authentication certificates.
15.
Given the choices below, what would a DHCP server perform?
A. Locate the DNS server
B. Lease an IP address
C. Identify an intruder
D. Provide an AOL account
Answer: B - DHCP has been a way to keep the limited number of IP addresses from
causing an Internet meltdown. It has nothing to do with DNS servers, and cannot
identify anything beyond an IP request. Furthermore, it has nothing to do with
America Online.
