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Worksheets

ENSA MIDTERM 7,8,9

Total questions: 100

Worksheet time: 55mins

Name
Class
Date
1.

Which two options describe a WAN?

a)

A WAN is owned and managed by an organization or home user.

b)

A WAN provides networking services over large geographical areas.

c)

WAN services are provided for a fee

d)

WANs providers offer low bandwidth speeds over short-distances.

e)

WANs guarantee security between the endpoints.

2.

Which topology type describes the virtual connection between source to destination?

a)

cabling topology

b)

physical topology

c)

logical topology

d)

wired topology

3.

Which type of WAN network design is the most fault-tolerant?

a)

Dual-homed topology

b)

Fully meshed topology

c)

hub-and-spoke topology

d)

partially meshed topology

e)

point-to-point topology

4.

Which is a type of WAN carrier connection that provides redundancy?

a)

dual-carrier WAN connection

b)

single-carrier WAN connection

5.

Which two statements about the WAN OSI Layer 1 are true?

a)

It describes how data will be encapsulated into a frame

b)

It describes the electrical, mechanical, and operational components needed to translate bits.

c)

It includes protocols such as PPP, HDLC, and Ethernet

d)

IT includes protocols such as SDH, SONET, DWDM

6.
a)

1

b)

2

c)

3

d)

4

e)

5

7.

a)

1

b)

2

c)

3

d)

4

e)

5

8.

a)

1

b)

2

c)

3

d)

4

e)

5

9.

a)

1

b)

2

c)

3

d)

4

10.

Which communication method is used in all WAN connections?

a)

Circuit-Switched

b)

Packet-Switched

c)

Parallel

d)

Serial

11.

Which service provider fiber-optic technology increases the data-carrying capacity using different wavelengths?

a)

DWDM

b)

SDH

c)

SONET

12.

Which traditional WAN connectivity option uses T-Carrier or E-Carrier lines?

a)

ATM

b)

Frame Relay

c)

ISDN

d)

Leased Lines

e)

PSTN

13.

Which two traditional WAN connectivity options are circuit-switched? (Choose two.)

a)

ATM

b)

Frame Relay

c)

ISDN

d)

Leased Lines

e)

PSTN

14.

Which two traditional WAN connectivity options are packet-switched? (Choose two.)

a)

ATM

b)

Frame Relay

c)

ISDN

d)

Leased Lines

e)

PSTN

15.

Which WAN connectivity option is based on Ethernet LAN technology?

a)

ATM

b)

Cable

c)

DSL

d)

Metro Ethernet

e)

MPLS

16.

Which is a service provider WAN solution that uses labels to direct the flow of packets through the provider network?

a)

ATM

b)

Cable

c)

DSL

d)

Metro Ethernet

e)

MPLS

17.

A company is expanding its business to other countries. All branch offices must remain connected to corporate headquarters at all times. Which network technology is required to support this scenario?

a)

WLAN

b)

WAN

c)

LAN

d)

MAN

18.

What is the recommended technology to use over a public WAN infrastructure when a branch office is connected to the corporate site?

a)

VPN

b)

municipal Wi-Fi

c)

ATM

d)

ISDN

19.

Which medium do service providers use to transmit data over WAN connections with SONET, SDH, and DWDM?

a)

copper

b)

Wi-Fi

c)

satellite

d)

fiber

20.

Which type of network would be used by a company to connect locations across the country?

a)

LAN

b)

SAN

c)

WLAN

d)

WAN

21.

a)

1

b)

2

c)

3

d)

4

22.

a)

1

b)

2

c)

3

d)

4

23.

a)

1

b)

2

c)

3

d)

4

24.

To which two layers of the OSI model do WAN technologies provide services? (Choose two.)

a)

presentation

b)

physical

c)

data link

d)

transport

e)

network

25.

A customer needs a metropolitan area WAN connection that provides high-speed, dedicated bandwidth between two sites. Which type of WAN connection would best fulfill this need?

a)

MPLS

b)

Ethernet WAN

c)

packet-switched network

d)

circuit-switched network

26.

An intercity bus company wants to offer constant Internet connectivity to the users traveling on the buses. Which two types of WAN infrastructure would meet the requirements? (Choose two.)

a)

cellular

b)

circuit-switched

c)

private infrastructure

d)

dedicated

e)

public infrastructure

27.

An enterprise has four branches. The headquarters needs full connectivity to all branches. The branches do not need to be connected directly to each other. Which WAN topology is most suitable?

a)

hub and spoke

b)

bus

c)

mesh

d)

full mesh

e)

point-to-point

28.

What are two common types of circuit-switched WAN technologies? (Choose two.)

a)

DSL

b)

PSTN

c)

ATM

d)

ISDN

e)

Frame Relay

29.

A new corporation needs a data network that must meet certain requirements. The network must provide a low cost connection to sales people dispersed over a large geographical area. Which two types of WAN infrastructure would meet the requirements? (Choose two.)

a)

private infrastructure

b)

satellite

c)

Internet

d)

dedicated

e)

public infrastructure

30.

Which VPN benefit allows an enterprise to easily add more users to the network?

a)

Cost Savings

b)

Security

c)

Scalability

d)

Compatibility

31.

Which VPN benefit allows an enterprise to increase the bandwidth for remote sites without necessarily adding more equipment or WAN links?

a)

Cost Savings

b)

Security

c)

Scalability

d)

Compatibility

32.

Which VPN benefit uses advanced encryption and authentication protocols to protect data from unauthorized access?

a)

Cost Savings

b)

Security

c)

Scalability

d)

Compatibility

33.

Which type of VPN is used to connect a mobile user?

a)

Site-to-site

b)

Remote-access

c)

GRE

d)

IPsec

34.

Which VPN solutions are typically managed by an enterprise? (Choose three)

a)

DMVPN

b)

MPLS Layer 3

c)

IPsec

d)

SSL

e)

Frame Relay

35.

What type of VPN can be established with a web browser using HTTPS?

a)

IPsec

b)

Client-based VPN

c)

Site-to-Site VPN

d)

Clientless VPN

36.

What type of protocol is GRE?

a)

Security

b)

Passenger

c)

Carrier

d)

Transport

37.

What type of VPN enables an enterprise to rapidly scale secure access across the organization?

a)

DMVPN

b)

Remote-Access

c)

Site-to-Site

d)

MPLS VPN

38.

What type of VPN enables an enterprise to emulate an Ethernet multiaccess LAN with remote sites?

a)

DMVPN

b)

Remote-access

c)

site-to-site

d)

MPLS VPN

39.
a)

1

b)

2

c)

3

d)

4

40.

IPsec can protect traffic in which OSI layers?

a)

L1 & L2

b)

L3

c)

L4 & L5

d)

L6

e)

L7

41.

Which IPsec function uses pre-shared passwords, digital certificates, or RSA certificates?

a)

IPsec protocol

b)

Confidentiality

c)

Integrity

d)

Authentication

e)

Diffie-Hellman

42.

True or False: The IPsec framework must be updated each time a new standard is developed.

a)

True

b)

False

43.

Which choices are packet encapsulation options supported by IPsec? (Choose two.)

a)

AES

b)

AH

c)

DH24

d)

ESP

e)

PSK

44.

Which choices provide for the Confidentiality function in the IPsec framework? (Choose three.)

a)

3DES

b)

AES

c)

AH

d)

PSK

e)

SEAL

45.

Which choices provide for the Integrity function in the IPsec framework? (Choose two.)

a)

MD5

b)

SHA

c)

SEAL

d)

AH

e)

AES

46.

Which choices are available for the Authentication function in the IPsec framework? (Choose two.)

a)

DH24

b)

AH

c)

SEAL

d)

RSA

e)

PSK

47.

Which Diffie-Hellman group choices are no longer recommended?

a)

1,2,5

b)

14,15,16

c)

19,20,21

d)

24

48.
a)

1

b)

2

c)

3

d)

4

e)

5

49.

The use of 3DES within the IPsec framework is an example of which of the five IPsec building blocks?

a)

authentication

b)

nonrepudiation

c)

integrity

d)

confidentiality

e)

Diffie-Hellman

50.

Which type of VPN may require the Cisco VPN Client software?

a)

MPLS VPN

b)

site-to-site

c)

remote access

d)

SSL VPN

51.

Which technique is necessary to ensure a private transfer of data using a VPN?

a)

encryption

b)

virtualization

c)

authorization

d)

scalability

52.

What are the two fundamental Dynamic Multipoint VPN tunnel types? (Choose two.)

a)

spoke-to-spoke

b)

server-to-client

c)

client-to-site

d)

site-to-site

e)

hub-to-spoke

53.
a)

1

b)

2

c)

3

d)

4

e)

5

54.

True or False?

All VPNs securely transmit clear text across the Internet.

a)

True

b)

False

55.

Which solution allows workers to telecommute effectively and securely?

a)

site-to-site VPN

b)

remote-access VPN

c)

dial up connection

d)

DSL connection

56.

Which VPN type is a service provider managed VPN?

a)

site-to-site VPN

b)

Layer 3 MPLS VPN

c)

remote access VPN

d)

GRE over IPsec VPN

57.

Which IPsec framework protocol provides data integrity and data authentication, but does not provide data confidentiality?

a)

DH

b)

IP protocol 50

c)

AH

d)

ESP

58.

What algorithm is used to provide data integrity of a message through the use of a calculated hash value?

a)

HMAC

b)

AES

c)

DH

d)

RSA

59.
a)

1

b)

2

c)

3

d)

4

60.

What is a type of VPN that is generally transparent to the end user?

a)

remote access

b)

public

c)

site-to-site

d)

private

61.

What is the variable amount of time it takes for a frame to traverse the links between the source and destination?

a)

serialization delay

b)

propagation delay

c)

code delay

62.

What happens when congestion occurs?

a)

packet loss

b)

jitter

c)

code delay

63.

What is the fixed amount of time it takes to transmit a frame from the NIC to the wire?

a)

serialization

b)

code delay

c)

jitter

64.

What is caused by variation in delay?

a)

congestion

b)

packet loss

c)

jitter

65.

Which type of traffic tends to consume a large portion of network capacity?

a)

voice

b)

video

c)

data

66.

Which type of traffic requires at least 384 Kbs of bandwidth?

a)

voice

b)

video

c)

data

67.

Which type of traffic is unpredictable, inconsistent, and bursty?

a)

voice

b)

video

c)

data

68.

Which type of traffic can be predictable and smooth?

a)

voice

b)

video

c)

data

69.

Which type of traffic cannot be retransmitted if lost?

a)

voice

b)

video

c)

data

70.

Which type of traffic must receive a higher UDP priority?

a)

voice

b)

video

c)

data

71.

Which queuing algorithm simultaneously schedules interactive traffic to the front of a queue to reduce response time?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

72.

Which queuing algorithm provides support for user-defined traffic classes?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

73.

Which queuing algorithm is effective for large links that have little delay and minimal congestion?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

74.

Which queuing algorithm classifies traffic into different flows based on packet header addressing?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

75.

Which queuing algorithm allows delay-sensitive data such as voice to be sent before packets in other queues?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

76.

Which queuing algorithm applies priority, or weights, to identify traffic and classify it?

a)

FIFO

b)

WFQ

c)

CBWFQ

d)

LLQ

77.

Which QoS model provides per-request policy admission control?

a)

best effort

b)

integrated services

c)

differential services

78.

Which QoS model requires no special QoS mechanisms?

a)

best effort

b)

integrated services

c)

differential services

79.

Which QoS model provides many different levels of quality?

a)

best effort

b)

integrated services

c)

differential services

80.

Which QoS model uses explicit end-to-end resource admission control?

a)

best effort

b)

integrated services

c)

differential services

81.

Which QoS model is the most scalable?

a)

best effort

b)

integrated services

c)

differential services

82.

Which detects when traffic rates reach a configured maximum rate and drops excess traffic?

a)

marking

b)

traffic policing

c)

traffic shaping

d)

WRED

e)

classification

83.

Which determines what class of traffic packets or frames belong to?

a)

marking

b)

traffic policing

c)

traffic shaping

d)

WRED

e)

classification

84.

Which adds a value to the packet header?

a)

marking

b)

traffic policing

c)

traffic shaping

d)

WRED

e)

classification

85.

Which provides buffer management and allows TCP traffic to throttle back before buffers are exhausted?

a)

marking

b)

traffic policing

c)

traffic shaping

d)

WRED

e)

classification

86.

Which retains excess packets in a queue and then schedules the excess for later transmission over increments of time?

a)

marking

b)

traffic policing

c)

traffic shaping

d)

WRED

e)

classification

87.

What is the term used to indicate a variation of delay?

a)

jitter

b)

serialization delay

c)

latency

d)

speed mismatch

88.

A network engineer performs a ping test and receives a value that shows the time it takes for a packet to travel from a source to a destination device and return. Which term describes the value?

a)

jitter

b)

latency

c)

priority

d)

bandwidth

89.
a)

1

b)

2

c)

3

d)

4

90.

Which device would be classified as a trusted endpoint?

a)

IP phone

b)

router

c)

switch

d)

firewall

91.
a)

1

b)

2

c)

3

d)

4

92.

Which type of traffic does Cisco recommend be placed in the strict priority queue (PQ) when low latency queuing (LLQ) is being used?

a)

voice

b)

video

c)

management

d)

data

93.

Which model is the only QoS model with no mechanism to classify packets?

a)

Hard QoS

b)

best-effort

c)

DiffServ

d)

IntServ

94.
a)

1

b)

2

c)

3

d)

4

95.

a)

1

b)

2

c)

3

d)

4

e)

5

96.

Which QoS model is very resource intensive and provides the highest guarantee of QoS?

a)

best-effort

b)

soft QoS

c)

IntServ

d)

DiffServ

97.
a)

1

b)

2

c)

3

d)

4

98.

In QoS models, which type of traffic is commonly provided the most preferential treatment over all other application traffic?

a)

FTP

b)

email

c)

web traffic

d)

voice traffic

99.

Which queuing mechanism supports user-defined traffic classes?

a)

FCFS

b)

FIFO

c)

WFQ

d)

CBWFQ

100.

What mechanism compensates for jitter in an audio stream by buffering packets and then replaying them outbound in a steady stream?

a)

voice codec

b)

WFQ

c)

digital signal processor

d)

playout delay buffer