1. Typing host tycho.luna.edu produces a response with the IP address 10.27.109.

Question

1. Typing host tycho.luna.edu produces a response with the IP address 10.27.109.201, but typing ping tycho.luna.edu produces a series of Destination Host Unreachable messages. What can you rule out as a cause of the problems with ping?

Select one:

a. A failure of your local router

b. A network cable unplugged from tyco.luna.edu

c. An unresponsive DNS server

d. A failure of tyco.luna.edu's router

2. You type route and see the following output. What network access limitation will this computer have?

Kernel IP routing table

Destination    Gateway    Genmask         Flags Metric Ref Use Iface

172.24.21.0    0.0.0.0    255.255.255.0   U     0      0      0 eth0

192.168.1.0    0.0.0.0    255.255.255.0   U     0      0      0 eth1

Select one:

a. You will be unable to access computers on the Internet at large.

b. Access to the 192.168.1.0/24 network will be disabled

c. Access to the 172.24.21.0/24 network will be disabled

d. Hostname resolution via DNS will not work correctly

3. You have been told that a special project must be completed. In order for that project to get done, TFTP (Trivial File Transfer Protocol) traffic must be allowed through the firewall. Which port should you enable for TFTP?

Select one:

a. 23

b. 69

c. 143

d. 389

4. Which of the following ports should you not block on a system that functions as a public Web server?

Select one:

a. 23

b. 25

c. 80

d. 137

5. You perform maintenance on a computer that required you to take down its network interface (eth0). You now want to bring its network interface back up using its preconfigured defaults. What command could you type to accomplish this goal?

Select one:

a. ifconfig eth0

b. iwconfig eth0

c. netstat eth0

d. ifup eth0

6. What are two common pull mail protocols used by clients to retrieve mail from ISPs? (Choose two.)

Select one or more:

a. IMAP

b. POP

c. SMTP

d. PAP

7. Explain the meaning of the following entry in the /etc/nsswitch.conf file:

hosts: files dns

Select one:

a.Outgoing network connections are only permitted to computers called files and dns.

b. The computers called files and dns are used as network switches.

c.The computers called files and dns are used as Netscape proxies.

d. The computer uses /etc/hosts followed by a DNS server for name resolution.

8. What file do you edit to tell Linux what DNS servers to use, if you use static IP addresses?

Select one:

a. /etc/dns.servers

b. /etc/nameservers

c. /etc/nameservers.conf

d. /etc/resolv.conf

Explanation / Answer

5] [A] ipconfig ethO

[6] [A]/[C]
MAP (Internet Message Access Protocol)
SMTP (Simple Mail Transfer Protocol) protocol is used by the Mail Transfer Agent (MTA) to deliver your eMail to the recipient's mail serve
[7] [C]
nsswitch.conf - Name Service Switch configuration file. /etc/nsswitch.conf file is used to configure which services are to be used to determine information such as hostnames, password files, and group files

[8] [D]
On Linux, the DNS servers that the system uses for name resolution are defined in the /etc/resolv.conf file. That file should contain at least one nameserver line. Each nameserver line defines a DNS server

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