CSIT432 Final

The physical layer of a network is responsible for

moving the data out/in along the transmission layer

How many networks and nodes per network are allowed by the Class B network?

16,384 networks and 65,534 nodes per network

What file specifies the order in which to use specified name services?

conf file

What protocol(s) is(are) allowed a user to retrieve her/his mail from the mail server to her/his mail reader?

IMAP and POP3

What layer of OSI determines the interface of the system with the user?

APPLICATION LAYER

In OSI network architecture, the routing is performed by

NETWORK LAYER

The 32-bit internet address 10000000 00001010 00000010 00011110 will be written in dotted decimal notation as

128.10.2.30

Which class network is used for a collection of a small number of networks with a large number of nodes?

CLASS A

What type of addressing format is used by Class A networks?

NET.NODE.NODE.NODE

Which program is used to schedule particular jobs or programs at particular times on the system?

CRON

Which file is used to configure which filesystems are mounted?

/etc/fstab

What tool is used to check and repair Linux file systems?

fsck

The command chmod 761 letter is equivalent to

UGO

What TCP/IP protocol is used for transferring electronic mail messages from one machine to another?

SMTP

Which of the following command is used to mount NFS filesystems?

mount

What command is used to terminate a process?

kill

Which command would mount the directory utilities from the server named sanfoundry on the local mount point /opt/sf?

mount - ns/sf:snfoundry/opt/sf

What is the name of the file, where we define our parent domain, or domain above us (in Linux Ubuntu)?

/etc/bind/named.conf.options

What is the setting to tell the secondary DNS, that there was a change in primary DNS that has to be updated?

SERIAL

What is the name of the file, where we define our domain (in Linux Ubuntu)?

/etc/bind/named.conf.local

What is the setting to tell the secondary DNS, WHEN to contact and update configuration files in primary DNS?

REFRESH

What is the name of DNS client configuration file?

/etc/resolv.conf

What is the name of configuration file that could resolve host names to IP Address locally?

/etc/hosts

What is the host name part of http://www.google.com?

www

What is the keyword used to define a domain alias?

CNAME

What is the keyword used to define a Mail Server?

MX

What is the basic function of the nslookup program?

probe the DNS database for various types of info

What file does the nslookup program use to locate a name server?

/etc/resolv.conf file

Besides the name server process, what are the other parts of the BIND package?

/etc/named.boot file

What command would you use to direct nslookup to use a server other than the one specified in /etc/resolv.conf?

server

What is the most common record type in DNS?

address A records

In what format are IPv6 addresses usually displayed?

128 bits of hexadecimal digits

Simple mail transfer protocol (SMTP) utilizes ---- as the transport layer protocol for electronic mail transfer

TCP

SMTP connections secured by SSL are known as

SMTPs

SMTP uses the TCP port

21

An email client needs to know the ---- of its initial SMTP server

IP address

SMTP defines

message transport

Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?

open mail relay

Which signal is sent by the command "kill -9 " ?

kill 9

We can change the priority of a running process using

task manager

A process is identified by a unique

PID (process identification number)

How is a subnet mask created?

by setting host bits to 0s and network bits to 1s

Which niceness value among the following indicate most favorable scheduling?

-20

Suppose that the 'sendmail' application is used on the current system as a mail transport agent. What file may user 'jdoe' modify in order to cause mail sent to him to be temporarily directed to an address outside the system's domain?

home.jdoe/.forward

Learns locations of MAC addresses and selectively forwards frames using unicast

SWITCH

The 128.180.0.0/24 CIDR IP address has how many bits are reserved for host addressing?

8 bit

How many networks can we have with a Class C network 204.17.5.0 (N.N.N.H) & subnet mask =255.255.255.252.

64

A Class B network (128.180.2.57 for example) has the following format?

N.N.H.H

Which layer of the TCP/IP stack adds source and destination addresses?

link

What item below describes a connection-oriented protocol with congestion control?

TCP

The following command has what effect on the scheduling priority?

nice -n 19 tar cvcf archive.tgz largfile

What file is responsible for making filesystems available to clients?

/etc/exports

What file guarantees NFS filesystems will be mounted at boot time?

/etc/fstab

What command is used to list the contents of crontab?

crontab -r

A host/machine can be uniquely identified by its

network

What device is used to connect two different networks?

gateway

What tool can be used to find the list of gateways traveled?

traceroute

What component of a mail system provides the means to read and compose mail?

mail transfer agent

/usr/bin/mailq is used to view?

mail error messages

What command gives the highest scheduling priority to all processes owned by user1?

SUDO RENICE 10 -U USER1

What file needs to be modified to inform sendmail not to use DNS?

/etc/mail/submit.mc

What routing scheme is used to send traffic to multiple nodes in the network?

multipath routing

What port does DNS run on?

UDP port 53

What protocol is used for sending outbound messages using sendmail?

SMTP

What command is used to temporarily make a filesystem available with NFS?

showmount

Which command is used to display the routing table?

netstat

What components make up NFS?

device, datastore, client

Data transmitted at the network layer is called a?

packet

What tool can be used to schedule future jobs/tasks?

the scheduler application

If ping works which tool can you use to see if a port/service is running?

nmap

What tool can be used to list all processes running on a Linux machine?

ps or top

The generic macro preprocessor used to build the sendmail config file?

m4

/etc/mail/sendmail.cf specifies:

choice of delivery agents

address rewriting rules

mail header formats

options

security precautions

spam resistance

Which routing scheme routes traffic to the closest node?

point to point

The data link layer contains what type of PDU?

frames

Which layer of the TCP/IP stack add source and destination addresses?

link

What item below describes a connection-oriented protocol with congestion control?

TCP

Given the table below, what is the syntax to have a command run at 2:30am every Monday?

30 2 ** 1 command

Which email access agent will leave read email on the message store?

IMAP

What layer of the TCP/IP model moves data along the transmission media (bits)?

physical

What component of a mail system is used to transport mail?

MTA (mail transfer agent)

The typical mail architecture includes?

- servers for incoming/outgoing mail

- a mail home for each user in an organization

- IMAP or POP for access by users

What item(s) below is not part of the typical process to configure sendmail?

?