Elance Computer Networks Test Answers 2015
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In the Command Prompt, what is the command to
show the most detailed printout of IP address info?
ipconfig /all
ipconfig
ping
itconfig
Which are the default settings for a Windows
XP computer network adapter?
Static IP address and configured as part of a
domain.
DHCP and configured as part of a workgroup.
There is no default settings for a Windows XP
network adapter card.
Static IP address and configured as part of
aworkgroup.
DHCP and configured as a part of a domain.
Can a computer also act as a router?
No
Yes
What is a protocol?
A protocol defines the order and format of messages
within a network.
A protocol is a standard for communications over
wireless networks.
A protocol dictates how a computer joins a network.
What is the second layer (layer 2) of the OSI
model?
Transport
Data Link
Physical
Network
Session
Which service reduce the response time for
client request and satisfy client request without involving origin server.
Cookies
Web Caching(Proxy Server)
User-Server state
Client server state
How is data transferred over a network?
Through chunks called packets.
One byte at a time.
Through clusters of bits called bytes.
All the data is transfered at once.
Is it possible to program at the socket level?
Yes
No
What is the difference between network address
and port number?
Network address resolve the address of software
application and port number search and identify hardware device.
Network address resolve the address of hardware
device and port number search and identify software application.
When you connect two network switches or two
computers directly what type of Ethernet cable do you need?
Cross-over
Connector
Straight through
The name of unit exchanged at network layer is
called:
Packets
TPDU
Frames
Bits
What is the normal reach of a signal from a
wireless router?
30 feet
200 feet
Depends on the physical constructs of the
environment, e.g., walls.
1000 feet
The process in which information packets are
forwarded to hops is called:
Communication
None of these
Routing
Switching
Which device is the central device of star
topology?
Fibre
Hub/Switch
Server
Router
FTP client contacts FTP server at port:
8080
21
80
What is the purpose of an IP?
To uniquely identify a host computer on a network.
To provide a host computer on the network an
identity.
To identify an application running on a network.
To limit the number of user errors on a network,
hence Idiot Proof.
What is the purpose of an IP?
To uniquely identify a host computer on a network.
To provide a host computer on the network an
identity.
To identify an application running on a network.
To limit the number of user errors on a network,
hence Idiot Proof.
What is a handshake?
The closing of communication between two hosts.
The intial set-up between two communicating hosts.
A gesture of frustration from a network
administrator.
What is the maximum supported distance for an
Ethernet cable run?
150 m / 492 ft
200 m / 656 ft
50m / 164 ft
100m / 328 ft
ADSL stands for:
Asymmetric digital subscriber line
Asymmetric dual smart line
None of these
Asymmetric double system line
What technology exists that allows a
non-routable IP address to communicate with the global IP Internet Network.
eBGP
CIDR Network address
NAT (Network Address Translation)
Route Summarization
Which of the following is NOT an example of a
client/server?
Web browser/server
email client/server
Peer-to-Peer between hosts.
Which protocol is used for email transmission?
IP
DHCP
FTP
IMAP
Which is example of wireless encryption?
IPSec
VPN
WPA
PPP
MAC
A firewall in a Computer Network is a
None of these
system to prevent unauthorized access.
simple web browsing software.
Physical boundary of network
TCP is a ___ protocol.
Best Effort
Unreliable
Connectionless
Connection Oriented
What is a MAC address?
A number associated with an IP address to direct
network communication to a specific application.
The network address for a computer running Mac OSX.
A unique hardware identification number for a
network card.
Another name for an IP address.
Which command will display the assigned IP
address of a network adpater installed on a Windows XP system?
Ipconfig
Ipadapter/all
WinIP
Configip
Winip/all
Which is the best example of a secure
password?
mysecretpassword
Xyz
MySpecialPa$$w0rd
password12345
Keep this place private
Which of the following is not a network
topology?
Bus
Star
Access
Ring
Which of the following is NOT a protocol?
TCP
IP
HTTP
PP
What is bandwidth?
Transmission rate.
The size of a rock band.
The physical size of a networking cable.
Port number of HTTP is:
65
90
21
80
How many layers are there in the OSI model?
3
10
7
8
Which of the following is a connection
oriented protocol?
RTP
TFTP
TCP
UDP
Which of the following is an Ethernet
connector type?
RJ-69
RJ-47
RJ-15
RJ-11
RJ-45
What type of network is commonly used in
houses?
PAN
MAN
WAN
LAN
Can computers with different operating systems
communicate over a network?
No, this is one of the limitations of current
networking technologies.
Yes, network communication is operating system
independent. What is important is if the computers are using the same protocol.
Yes, but special software is required.
No, this is one of the limitations of current
operating systems.
Is it possible to connect two computers
without using any hubs or routers for network communication?
No, not withough special equipment that is very
expensive.
Yes, using a cross-over cable.
No, networking was not meant to work that way.
What is NIC?
Network Interface Card
National Integration Circuit
Net Interface card
New Internet Card
Is it possible for a computer on local network
A to talk to a computer on a local network B?
No
No, not withough special equipment that is very
expensive.
Yes only if an entry-point (such as a router) for
each local network is provided.
Yes, but it must be done via a wireless network
between the local networks.
Open System Interconnection (OSI) Model has
following layers:
6
Its not a layered architecture.
5
7
Which one is connectionless protocol?
UDP
TCP
When can a wireless device NOT connect to a
wireless network?
If the wireless device supports wireless B and the
wireless router only supports wireless G.
If the wireless device has a MAC address blocked by
the wireless router.
If the wireless device does not support the
security encryption of the wireless router.
All of these.
What is currently the most common and fastest
transmission rate for ethernet cables?
56k
Megabit
Gigabit
10-base
Which IP address is reserved for loopback
testing and debugging?
192.168.1.1
127.256.0.1
0.0.0.0
127.0.0.1
What is the purpose of a static IP?
To ensure stability on the entire network.
To gaurantee the IP of the computer/server will not
change.
None of these
To limit the transmision rate of a computer/server.
Which of the following is NOT an application
layer protocol for email?
POP
TCP
SMTP
IMAP
Which of the network type covers the country
level location:
Local Area Network
Internet
Wide area Network
Personal Area Network
What is the maximum Ethernet cable length
between repeaters (computers or switches)?
100 m (328 feet)
200 m (656 feet)
120 m (394 feet)
60 m (197 feet)
50 m (164 feet)
Which item is an example of a physical network
address?
IP address
Workstation name
www.proprofs.com
MAC address
Mrbig@proprofs.com
A user loads a web browser and browses to
http://www.google.com, what is the highest layer of the OSI model the user is
functioning at?
Transport Layer
Application Layer
Session Layer
Network Layer
Which of the following major networks contain
an incorrect subnet mask?
Class C with a mask 255.255.255.0 or /24
Class D with a mask 255.255.255.255 or /32
Class B with a mask 255.255.0.0 or /16
Class A with a mask 255.0.0.0 or /8
Print server uses ________ which is a buffer
that holds data before it is send to the printer.
Node
Queue
Spool
None of these
What best describes a client/server model?
The relationship between a patron of a business and
a employee of that business.
A client host requests a service from an always-on
server.
When one host requests information from another
host.
What is considered part of a network core?
Server
Routers
Applications
Hosts
When using the PING utility, what are you
trying to accomplish?
Tracing the route that a IP packet is taking
Are ICMP ports opened on the remote end?
Does connectivity exist between two IP end points
Determining if a TCP connection can be established
UDP is an unreliable protocol.
True
False
Which IPv4 address is not valid?
169.254.0.8
192.168.0.5
10.10.0.5
25.740.265.70
8.8.8.8
Which of the given TCP/IP protocols can assign
a logical address to a host?
SMTP
CAD
IP
TCP
UDP
Which switching type has the re-route
capability:
Circuit Switching
None of them
Packet Switching
IPv6 address space is:
2^32
2^16
2^64
2^128
The default MTU of a typical Ethernet is
1500
1476
1458
1384
Where is a hub specified in the OSI model?
Application layer
Data Link layer
Physical layer
Session layer
Technically, what is the difference between
HUB and Switch?
Hub operate using a broadcast model and switches operate
using a virtual circuit model
None of Them
Switch operate using a broadcast model and Hub
operate using a virtual circuit model
Hub is a ----------- device.
Anycast
Unicast
Multicast
Broadcast
____ protocol is used by Telnet.
IP
DHCP
UDP
TCP
A server that has HTTP services and SMTP
services bound to an interface functions with what protocol?
DHCP
IP
TCP
UDP
What does the term "Map Network
Drive" mean?
Trace the path to the local area network gateway.
Divide the host HDD into memory locations.
A schematic drawing of all network adapter
locations on the network system.
Send instructions to a user to access the remote
local area network.
Create a shortcut to a network location.
If you wanted to test to see if a TCP port was
opened on a server, what command/tool would you use?
FTP
Telnet
Ping
Firefox
Which of the following IP addresses is a class
A Network?
192.35.111.1
0.0.0.1
191.77.56.1
128.30.33.1
TCP contains fields in the header of TCP
Segment to identify upper layer applications, what are these fields?
The TYPE field
Options
The TTL field
Source and Destination Port Numbers
Given the IP address 82.77.201.1/24, what is
the network number?
82.77.201.255
82.77.0.0
82.77.201.0
82.0.0.0
What fields in the header of an IP packet will
be decremented by one that is passed through each router?
The Header Checksum
The Type of Service
The Time to Live (TTL)
The Protocol Number
Skype is an example of:
peer-to-peer model (Hybrid)
None of the above
Client/Server model
End systems(hosts)
What does an assigned IP addres 169.254.0.12
indicate?
The computer is configured for DHCP and cannot
connect to the DHCP server
The computer has been configurd to work with a
Linux system.
The computer is using a dial-up modem.
The computer is being used as an Internet shared
connection host.
The computer is configured with a static IP
address.
A network with more than one exit point.
different networks could communicate.
application developers can change only one layer's
protocols at a time.
To create a layered model larger than the DoD
model.
Cisco could use the model.
IP Addresses are 48 bit addresses and MAC
addresses are 32 bit addresses written in hexadecimal format
True
False
Which of the following is/are NOT the
difference between TCP and UDP?
All of them are correct
TCP is a connection oriented protocol whereas UDP
is datagram oriented protocol
Re-transmission of lost packets is possible in TCP
whereas in UDP, it is not possible
Delivery of data is guaranteed in TCP whereas it
cannot be guaranteed in UDP
Sequencing of data is a feature of TCP whereas
there is no sequencing of data in UDP
Which network topology is based on a hierarchy
of nodes?
Mesh
Bus
Tree
Ring
Which network type can have transmission of
data in both directions but not simultaneously.
None of these
Full Duplex
Simple
Half Duplex
Which is NOT a wireless network signal?
B
A
C
G
What is the subnet mask of this network:
192.168.0.0/29
255.255.255.29
255.255.255.248
192.168.0.255
255.255.255.0
192.168.0.1
What is the maximum speed of a wireless G
network?
11Mbps
54Mbps
300Mbps
150Mbps
Who initiates a connection between a client
and server?
Server
Router
Sockets
Client
In TCP/IP model, TCP and UDP protocols work on
which layer:
Application layer
Physical layer
Network layer
Transport layer
For 802.11b wireless, how many frequency
channels are available to avoid collisions/interference?
24
5
11
10
Does P2P require an always on server?
Yes
Sometimes
No
Which topology uses terminators?
None of these
Ring
BUS
Star
The name of unit exchanged at Data Link Layer
is called:
Packets
Frames
TPDU
Unit
A router that responds to an ARP request
intended for a remote host is called what?
Proxy IP
Inverse ARP
Proxy ARP
Gratutious ARP
What or who is responsible for top-level
country domains such as uk, ca, and jp?
Top-level domain (TLD) servers.
The local government's network administration.
Country-wide domain (CWD) servers.
The businesses of the respective country.
In IPv4 addresses, how many addresses are
available?
2^16
None of these
2^32
2^64
You are a Network Administrator for the ACME
company; one of your webservers had a hardware issue, so you moved the IP
address (192.168.1.99) to another webserver. Users from other networks are
reporting that they still are not able to access the website. You are able to
access the website locally; What is the best answer that will fix the issue.
Update NAT
Start the Web Service application
Clear the ARP Cache on the router
Add a firewall rule
Which protocol is used to send a destination
network unknown message back to originating hosts?
BootP
ARP
ICMP
TCP
What is the purpose of the ARP (Address
Resolution Protocol)?
Resolves a MAC address to a DNS name
Resolves a MAC address to an IP address
Resolves a DNS name to a MAC address
Resolves an IP address to a MAC address
Variability of packet delays within the same
packet stream is called
Delayed packet
None of these
Jitter
Delayed buffer
Is a DNS required for hosting a website?
No, but that means there will be no translation
from hostname to IP address.
Yes, since no one could ever visit your website
without a DNS.
No because DNS is a luxury that only large
businesses can afford.
What is the primary Layer 3 protocol in the
TCP/IP suite?
IP
ARP
TCP
UDP
In what Operating System(s) are sockets file
descriptors?
Mac OSX
Unix
Unix and Mac OSX
Windows
Which topology has a single point failure,
i.e. One cable broken whole network is off.
Ring
Mesh
Star
Bus
Your ISP has given you a block of addresses:
199.200.199.0/25; how many IP addresses are available for devices on a network.
254
256
126
25
A subset of machines receive and process the
packets, this type of addressing is called:
Broadcast
Multicast
Unicast
Anycast
What are the two sub layers of the Data Link
layer of the OSI model?
MAC and LLC
TCP and UDP
IP and LLC
NAC and STP
MAC and CDP
What is a stub network?
A network with more than one exit and entry point.
A network with only one entry and no exit point.
A network that has only one entry and exit point.
A network with more than one exit point.
If a maximum MTU was set to 1300 in the
Windows Vista operating system, what would be the smallest packet you can send
if you utilize the PING command with the Don't Fragment bit option set?
1300
1272
1500
1372
TCP contains several features that benefit the
protocol, which of the following answers is not a feature?
Reliable
Full Duplex
Point to Point
Low overhead
There are two access points (wireless routers)
A and B that belong to the same subnet. What happens when a mobile device
connected to A leaves A's range and enters B's range?
The user of the mobile device must select the new
access point to connect to it.
The mobile device cannot switch to another access
point.
The mobile device connects to the new access point
B and gets a new IP address.
The mobile device connects to the new access point
B and keeps the same IP address.
When a host is generating an ARP packet, what
is unknown?
The Target’s Ethernet Hardware Address
The sender’s Ethernet Hardware Address
The Target's Hardware port number
The Sender’s IP address
Is a socket controlled at the application
level in an operating system?
No
Sometimes
Yes
There are 5 class of IPv4 addresses, what are
the class D addresses used for?
Unicast
Multicast
Experiental
Broadcast
In WLAN, the problem of a station not being
able to detect a potential competitor because of being distant is the
Hidden Station Problem
Exposed Station Problem
None of them
What command to view routing table in Windows
route print
show ip
show route
route list
netstat -ar
How many layers does a TCP/IP Protocol stack
have?
6
4
None of these
7
At layer 4, what port is reserved for TFTP and
what protocol is used?
96, UDP
69, UDP
161, UDP
69, TCP
IPv4 addresses are divided into how many
classes?
5
4
2
3
Which of the following is a rfc1918 address?
191.34.100.1
82.41.108.21
172.33.41.100
10.70.40.103
Which of the following documents detail
address allocation for private internets?
EIA/TIA 568B
OSI model
RFC 791
RFC 1918
IEEE 802.3 ae
What does RFC1918 provide?
3 ranges of non-routable addresses to use for
private networks.
An address block for special use in link-local
addressing for IPv4 networks
A new version of internet protocol, using 128 bits
for the addresses.
Unique local addresses for IPv6 networks.
Which of the following protocol belongs to
"Exterior Gateway Protocol"?
RIP
EIGRP
IGRP
OSPF
BGP
The TCP 3-Way handshake contains three
messages that are exchange between two hosts before any application data is
transmitted, what does a SYN-ACK message indicate?
First message of a 3-Way handshake
None of the above
Third and final message of a 3 way handshake
Second message of a 3-Way handshake
Which layer of the OSI model is responsible
for establishing, managing, and terminating communications between two
computers?
Application
Session
Network
Data
Link
Transport
Which wireless standard is designed for a
maximum data tranfer rate of 11 Mb?
Bluetooth
IEEE 802.11g
IEEE 802.11a
IEEE 802.11b
IEEE 802.6
Which of the following cable types is most
susceptible to cross talk?
STP
UTP
Coaxial
Fiber optic
What debugging tool would you use to
troubleshoot TCP connections from client to a server that was experiencing slow
transfers and intermittent connectivity?
Telnet
Wireshark/TCPDump
Ping
Traceroute
Which method of communication is used to
support Ethernet type networks?
VPN
Broadcast
Token ring
Bus
Open Link
What layer of the OSI model does ICMP work on
?
Layer 6
Layer 4
Layer 7
Layer 3
Layer 2
An IPv4 header contains a Time To Live (TTL)
field, what is the purpose of TTL?
To prevent routing loops
Used to track of the number of routers that can
forward traffic
To count how many routers are in the path between
the source and destination
How long a learned route remains in the routing
table before being dropped
Which protocol does DHCP use at the Transport
layer?
IP
ARP
TCP
UDP
What is binary 00011000.01001100.00001010
equivalent to in Decimal?
20.68.10
24.76.10
30.66.11
18.70.10
What is the Subnet Mask of this CIDR Block
123.45.67.89/29?
255.255.255.255
255.255.255.252
255.255.255.248
255.255.255.224
255.255.255.0
Which is NOT a transport layer protocol?
SMTP
ATP
UDP
TCP
Which of the following is an example of a
Class B network address?
224.0.0.9
120.3.245.2
10.10.10.10
163.4.2.1
192.167.0.2
You were given a network address of
67.230.100.64/27 from your ISP, what would the broadcast address be?
255.255.255.255
67.230.100.95
67.230.100.65
67.230.100.96
Which multiplexing allows an optical fibre to
carry multiple optical signals simultaneously
WDM
FDM
None of these
TDM
Which of the following high-speed circuits is
the fastest?
T1
T2
T3
DS3
What is the IP protocol number of TCP?
1
6
12
17
2
For UPD/IP or TCP/IP socket communication,
what four parameters are generally needed?
Source Identifyer, Source Port, Destination
Identifier, and Destination Port
Source Router IP, Source Port, Destination Router
IP, and Destination Port
Source Socket, Source Port, Destination Socket, and
Destination Port
Source Identifyer, Source Socket, Destination
Identifier, and Destination Socket
Which of the following is not a layer of the
three tier hierarchical model?
Access
Distribution
Server
Core
You have a network address of 192.168.56.0
with four subnets. You want to allow for maximum number of Hosts. What is the
subnet mask you need to apply?
255.255.255.192
255.255.255.224
255.255.255.128
255.255.224.0
An IP header contains a "Blank"
field that identifies the type of data that is encapsulated in an IP Packet.
The Header Checksum
The Time to Live
The Type of Service
The Protocol Number
How does a host determine that an IP address
is not located on the local network?
The host would ARP to determine if the host is
local or not.
The DHCP notifies the host if the IP is remote or
not.
"The ANDing process"
Any host will transmit all packets to the default
gateway
How many collision domains exist on an 8 port
hub?
16
7
1
8
138.19.50.0/27 provides how many subnets
(including the all 0 and 1s subnet)?
8
16
7
6
Which of the following is the decimal and
hexadecimal equivalents of the binary number 01101101?
182, 7D
109, 6F
109, 6D
182, 6D
What protocol does PPP use to identify the
Network layer protocol?
LCP
NCP
ISDN
HDLC
What is packet switching?
A networking model where a computer is assigned dedicated
network resources for transmission
What happens when computer A receives a packet
meant for computer B and vice versa.
When packets are switched during transit.
A networking model where a computer shares
networking resources for transmission.
Assuming no PPP compression, standard network
MTU of 1500, an IP packet that contains a TCP segment with TCP timestamps and
is encapsulated in a Ethernet frame with no 802.1q tags, what would the data
rate efficiency be?
97.3333%
94.1482%
95.9264%
96.1781%
What is circuit switching?
Switching between different network circuts that
support different speeds and functionality when transmitting between two
computers.
A networking model where a computer shares
networking resources for transmission.
A networking model where a computer is assigned
dedicated network resources for transmission
The relay switching of the underlying circitry in a
network.
Which layer provide end-to-end delivery:
Network layer
Data Link Layer
None of these
Transport Layer
How many collision domains exist on a 24 port
switch?
1
23
24
48
What is the IEEE standard for Ethernet?
802.2
802.3
802.1x
802.11
If you are able to browse to a website by IP
address but not URL, which of these would NOT be the cause?
The wireless networking capability on your computer
is turned off.
Authoritative DNS server issues.
The zone file has been updated and the TTL on the
old information hasn't expired.
Your computer doesn't have any DNS server
information.
The domain name has expired.
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