Sample questions for Exam #2

1. What is wrong with this routing table?

   127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1        1
   205.217.146.0    255.255.255.0    205.217.146.200  205.217.146.200  1
   205.217.146.200  255.255.255.255  127.0.0.1        127.0.0.1        1
   205.217.146.255  255.255.255.255  205.217.146.200  205.217.146.200  1
   224.0.0.0        224.0.0.0        205.217.146.200  205.217.146.200  1
   255.255.255.255  255.255.255.255  205.217.146.200  205.217.146.200  1
   

2. Suppose a user has trouble accessing a website hosted on a name-based virtual host. How could this occur?

3. How does DNS solve scalability problems?

4. What are some of the security problems associated with NFS and how can these issues be avoided?

5. Give the path of the sendmail configuration file which can be modified.

6. Compare and Contrast NFS, Samba, and AFS

7. Explain how the DNS A and PTR records can provide a level of authentication.

8. The following commands are executed, in the following order:

   touch tmp1
   ln tmp1 tmp2
   ln -s tmp1 tmp3
   ln -s tmp2 tmp4
   rm tmp1
   

   What will be the state of the files (tmp1, tmp2, tmp3, tmp4)?

9. Describe the 5 network layers.

1. What is sendmail's configuration file?

2. What is DHCP and how does it work?

3. What are the advantages of CIDR (Classless Inter-Domain Routing)?

4. What steps must be taken to use a CGI script in Apache?

5. Why is it necessary for you to update the /etc/resolv.conf file each time you boot up your sandbox drive in order for it's associated service to function correctly?

6. What does the command 'netstat -rn' do? What are at least 2 other uses for the netstat command?

7. What are the advantages and disadvantages of automounting an NFS?

8. What are some advantages to having a local proxy server on your network?

9. If a packet of size 576 encounters a router with an MTU of 1500, which of the following would occur?
   a) The packet would go through an IP fragmentation
   b) There will be many acknowledgments being sent and handled due to the data to header ratio
   c) The packet is sent back to the sender
   d) None of the above
   

10. What is NFS's no_root_squash export option and why can it be dangerous?

11. How are the client mount points and the exported file systems tracked on the server?

12. Name at least 4 Top-Level Domains in the U.S. and what they are used for; Name at least 3 types of records found in an SOA header and what they are for.

13. With NFS, what is typically used to prevent users with root access on a client from gaining access to any file? How does it work?

14. What are the 5 network layers and what do those layers contain?

15. What are some advantages of using a caching proxy server?