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WorksheetsENSA MIDTERM 7,8,9
Total questions: 100
Worksheet time: 55mins
Which two options describe a WAN?
A WAN is owned and managed by an organization or home user.
A WAN provides networking services over large geographical areas.
WAN services are provided for a fee
WANs providers offer low bandwidth speeds over short-distances.
WANs guarantee security between the endpoints.
Which topology type describes the virtual connection between source to destination?
cabling topology
physical topology
logical topology
wired topology
Which type of WAN network design is the most fault-tolerant?
Dual-homed topology
Fully meshed topology
hub-and-spoke topology
partially meshed topology
point-to-point topology
Which is a type of WAN carrier connection that provides redundancy?
dual-carrier WAN connection
single-carrier WAN connection
Which two statements about the WAN OSI Layer 1 are true?
It describes how data will be encapsulated into a frame
It describes the electrical, mechanical, and operational components needed to translate bits.
It includes protocols such as PPP, HDLC, and Ethernet
IT includes protocols such as SDH, SONET, DWDM
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
Which communication method is used in all WAN connections?
Circuit-Switched
Packet-Switched
Parallel
Serial
Which service provider fiber-optic technology increases the data-carrying capacity using different wavelengths?
DWDM
SDH
SONET
Which traditional WAN connectivity option uses T-Carrier or E-Carrier lines?
ATM
Frame Relay
ISDN
Leased Lines
PSTN
Which two traditional WAN connectivity options are circuit-switched? (Choose two.)
ATM
Frame Relay
ISDN
Leased Lines
PSTN
Which two traditional WAN connectivity options are packet-switched? (Choose two.)
ATM
Frame Relay
ISDN
Leased Lines
PSTN
Which WAN connectivity option is based on Ethernet LAN technology?
ATM
Cable
DSL
Metro Ethernet
MPLS
Which is a service provider WAN solution that uses labels to direct the flow of packets through the provider network?
ATM
Cable
DSL
Metro Ethernet
MPLS
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?
WLAN
WAN
LAN
MAN
What is the recommended technology to use over a public WAN infrastructure when a branch office is connected to the corporate site?
VPN
municipal Wi-Fi
ATM
ISDN
Which medium do service providers use to transmit data over WAN connections with SONET, SDH, and DWDM?
copper
Wi-Fi
satellite
fiber
Which type of network would be used by a company to connect locations across the country?
LAN
SAN
WLAN
WAN
1
2
3
4
1
2
3
4
1
2
3
4
To which two layers of the OSI model do WAN technologies provide services? (Choose two.)
presentation
physical
data link
transport
network
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?
MPLS
Ethernet WAN
packet-switched network
circuit-switched network
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.)
cellular
circuit-switched
private infrastructure
dedicated
public infrastructure
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?
hub and spoke
bus
mesh
full mesh
point-to-point
What are two common types of circuit-switched WAN technologies? (Choose two.)
DSL
PSTN
ATM
ISDN
Frame Relay
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.)
private infrastructure
satellite
Internet
dedicated
public infrastructure
Which VPN benefit allows an enterprise to easily add more users to the network?
Cost Savings
Security
Scalability
Compatibility
Which VPN benefit allows an enterprise to increase the bandwidth for remote sites without necessarily adding more equipment or WAN links?
Cost Savings
Security
Scalability
Compatibility
Which VPN benefit uses advanced encryption and authentication protocols to protect data from unauthorized access?
Cost Savings
Security
Scalability
Compatibility
Which type of VPN is used to connect a mobile user?
Site-to-site
Remote-access
GRE
IPsec
Which VPN solutions are typically managed by an enterprise? (Choose three)
DMVPN
MPLS Layer 3
IPsec
SSL
Frame Relay
What type of VPN can be established with a web browser using HTTPS?
IPsec
Client-based VPN
Site-to-Site VPN
Clientless VPN
What type of protocol is GRE?
Security
Passenger
Carrier
Transport
What type of VPN enables an enterprise to rapidly scale secure access across the organization?
DMVPN
Remote-Access
Site-to-Site
MPLS VPN
What type of VPN enables an enterprise to emulate an Ethernet multiaccess LAN with remote sites?
DMVPN
Remote-access
site-to-site
MPLS VPN
1
2
3
4
IPsec can protect traffic in which OSI layers?
L1 & L2
L3
L4 & L5
L6
L7
Which IPsec function uses pre-shared passwords, digital certificates, or RSA certificates?
IPsec protocol
Confidentiality
Integrity
Authentication
Diffie-Hellman
True or False: The IPsec framework must be updated each time a new standard is developed.
True
False
Which choices are packet encapsulation options supported by IPsec? (Choose two.)
AES
AH
DH24
ESP
PSK
Which choices provide for the Confidentiality function in the IPsec framework? (Choose three.)
3DES
AES
AH
PSK
SEAL
Which choices provide for the Integrity function in the IPsec framework? (Choose two.)
MD5
SHA
SEAL
AH
AES
Which choices are available for the Authentication function in the IPsec framework? (Choose two.)
DH24
AH
SEAL
RSA
PSK
Which Diffie-Hellman group choices are no longer recommended?
1,2,5
14,15,16
19,20,21
24
1
2
3
4
5
The use of 3DES within the IPsec framework is an example of which of the five IPsec building blocks?
authentication
nonrepudiation
integrity
confidentiality
Diffie-Hellman
Which type of VPN may require the Cisco VPN Client software?
MPLS VPN
site-to-site
remote access
SSL VPN
Which technique is necessary to ensure a private transfer of data using a VPN?
encryption
virtualization
authorization
scalability
What are the two fundamental Dynamic Multipoint VPN tunnel types? (Choose two.)
spoke-to-spoke
server-to-client
client-to-site
site-to-site
hub-to-spoke
1
2
3
4
5
True or False?
All VPNs securely transmit clear text across the Internet.
True
False
Which solution allows workers to telecommute effectively and securely?
site-to-site VPN
remote-access VPN
dial up connection
DSL connection
Which VPN type is a service provider managed VPN?
site-to-site VPN
Layer 3 MPLS VPN
remote access VPN
GRE over IPsec VPN
Which IPsec framework protocol provides data integrity and data authentication, but does not provide data confidentiality?
DH
IP protocol 50
AH
ESP
What algorithm is used to provide data integrity of a message through the use of a calculated hash value?
HMAC
AES
DH
RSA
1
2
3
4
What is a type of VPN that is generally transparent to the end user?
remote access
public
site-to-site
private
What is the variable amount of time it takes for a frame to traverse the links between the source and destination?
serialization delay
propagation delay
code delay
What happens when congestion occurs?
packet loss
jitter
code delay
What is the fixed amount of time it takes to transmit a frame from the NIC to the wire?
serialization
code delay
jitter
What is caused by variation in delay?
congestion
packet loss
jitter
Which type of traffic tends to consume a large portion of network capacity?
voice
video
data
Which type of traffic requires at least 384 Kbs of bandwidth?
voice
video
data
Which type of traffic is unpredictable, inconsistent, and bursty?
voice
video
data
Which type of traffic can be predictable and smooth?
voice
video
data
Which type of traffic cannot be retransmitted if lost?
voice
video
data
Which type of traffic must receive a higher UDP priority?
voice
video
data
Which queuing algorithm simultaneously schedules interactive traffic to the front of a queue to reduce response time?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm provides support for user-defined traffic classes?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm is effective for large links that have little delay and minimal congestion?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm classifies traffic into different flows based on packet header addressing?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm allows delay-sensitive data such as voice to be sent before packets in other queues?
FIFO
WFQ
CBWFQ
LLQ
Which queuing algorithm applies priority, or weights, to identify traffic and classify it?
FIFO
WFQ
CBWFQ
LLQ
Which QoS model provides per-request policy admission control?
best effort
integrated services
differential services
Which QoS model requires no special QoS mechanisms?
best effort
integrated services
differential services
Which QoS model provides many different levels of quality?
best effort
integrated services
differential services
Which QoS model uses explicit end-to-end resource admission control?
best effort
integrated services
differential services
Which QoS model is the most scalable?
best effort
integrated services
differential services
Which detects when traffic rates reach a configured maximum rate and drops excess traffic?
marking
traffic policing
traffic shaping
WRED
classification
Which determines what class of traffic packets or frames belong to?
marking
traffic policing
traffic shaping
WRED
classification
Which adds a value to the packet header?
marking
traffic policing
traffic shaping
WRED
classification
Which provides buffer management and allows TCP traffic to throttle back before buffers are exhausted?
marking
traffic policing
traffic shaping
WRED
classification
Which retains excess packets in a queue and then schedules the excess for later transmission over increments of time?
marking
traffic policing
traffic shaping
WRED
classification
What is the term used to indicate a variation of delay?
jitter
serialization delay
latency
speed mismatch
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?
jitter
latency
priority
bandwidth
1
2
3
4
Which device would be classified as a trusted endpoint?
IP phone
router
switch
firewall
1
2
3
4
Which type of traffic does Cisco recommend be placed in the strict priority queue (PQ) when low latency queuing (LLQ) is being used?
voice
video
management
data
Which model is the only QoS model with no mechanism to classify packets?
Hard QoS
best-effort
DiffServ
IntServ
1
2
3
4
1
2
3
4
5
Which QoS model is very resource intensive and provides the highest guarantee of QoS?
best-effort
soft QoS
IntServ
DiffServ
1
2
3
4
In QoS models, which type of traffic is commonly provided the most preferential treatment over all other application traffic?
FTP
web traffic
voice traffic
Which queuing mechanism supports user-defined traffic classes?
FCFS
FIFO
WFQ
CBWFQ
What mechanism compensates for jitter in an audio stream by buffering packets and then replaying them outbound in a steady stream?
voice codec
WFQ
digital signal processor
playout delay buffer
