Elance Computer Networks Test Answers 2015



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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