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Worksheets105P2 Module 6, 7, & 8 Review
Total questions: 39
Worksheet time: 37mins
(Module 6)
Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network? (Choose two.)
NAT will impact negatively on switch performance.
NAT causes routing tables to include more information.
NAT introduces problems for some applications that require end-to-end connectivity.
NAT provides a solution to slow down the IPv4 address depletion.
NAT adds authentication capability to IPv4.
A network administrator wants to examine the active NAT translations on a border router. Which command would perform the task?
Router# show ip nat translations
Router# debug ip nat translations
Router# clear ip nat translations
Router# show ip nat statistics
What are two tasks to perform when configuring static NAT? (Choose two.)
Identify the participating interfaces as inside or outside interfaces.
Define the outside global address.
Define the inside global address on the server
Create a mapping between the inside local and inside global addresses.
Configure a NAT pool.
What is a disadvantage of NAT?
The router does not need to alter the checksum of the IPv4 packets.
There is no end-to-end addressing.
The costs of readdressing hosts can be significant for a publicly addressed network.
The internal hosts have to use a single public IPv4 address for external communication.
What is one advantage of using NAT at the edge of the network?
NAT enables end-to-end IPv4 traceability, making troubleshooting easier.
Dynamic NAT allows devices from outside the local network to easily initiate TCP connections to inside hosts.
Performance is significantly increased because the router does not have to perform as many route lookups.
Changing ISPs is simpler because the devices on the inside network do not have to be configured with new addresses when the outside address changes.
What benefit does NAT64 provide?
It allows sites to connect IPv6 hosts to an IPv4 network by translating the IPv6 addresses to IPv4 addresses.
It allows sites to use private IPv4 addresses, and thus hides the internal addressing structure from hosts on public IPv4 networks.
It allows sites to connect multiple IPv4 hosts to the Internet via the use of a single public IPv4 address.
It allows sites to use private IPv6 addresses and translates them to global IPv6 addresses.
What address translation is performed by static NAT?
An outside local address is translated to a specified outside global address.
An inside local address is translated to a specified outside global address.
An inside local address is translated to a specified outside local address.
An inside local address is translated to a specified inside global address.
Using NAT terminology, what is the address of the source host on a private network as seen from inside the network?
outside global
inside local
inside global
outside local
Which statement accurately describes dynamic NAT?
It provides a mapping of internal host names to IP addresses.
It dynamically provides IP addressing to internal hosts.
It provides an automated mapping of inside local to inside global IP addresses.
It always maps a private IP address to a public IP address.
Why is NAT not needed in IPv6?
The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.
Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks.
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.
The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers.
A company designs its network so that the PCs in the internal network are assigned IP addresses from DHCP servers, and the packets that are sent to the Internet are translated through a NAT-enabled router. What type of NAT enables the router to populate the translation table from a pool of unique public addresses, as the PCs send packets through the router to the Internet?
dynamic NAT
ARP
static NAT
PAT
What is a security feature of using NAT on a network?
allows external IP addresses to be concealed from internal users
denies all internal hosts from communicating outside their own network
allows internal IP addresses to be concealed from external users
denies all packets that originate from private IP addresses
When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?
No users can access the server.
The request to the server for the seventh user fails.
All users can access the server.
The first user gets disconnected when the seventh user makes the request.
(Module 8)
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?
LAN
MAN
WLAN
WAN
What is the recommended technology to use over a public WAN infrastructure when a branch office is connected to the corporate site?
VPN
ATM
municipal Wi-Fi
ISDN
Which medium do service providers use to transmit data over WAN connections with SONET, SDH, and DWDM?
copper
fiber optic
Wi-Fi
satellite
Which statement describes a characteristic of a WAN?
All serial links are considered WAN connections.
WAN networks are owned by service providers.
A WAN operates within the same geographic scope of a LAN, but has serial links.
A WAN provides end-user network connectivity to the campus backbone.
Which type of network would be used by a company to connect locations across the country?
SAN
LAN
WAN
WLAN
A small company with 10 employees uses a single LAN to share information between computers. Which type of connection to the Internet would be appropriate for this company?
a dialup connection that is supplied by their local telephone service provider
private dedicated lines through their local service provider
Virtual Private Networks that would enable the company to connect easily and securely with employees
a broadband service, such as DSL, through their local service provider
To which two layers of the OSI model do WAN technologies provide services? (Choose two.)
network layer
data link layer
session layer
presentation layer
physical layer
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
private infrastructure
circuit-switched
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?
bus
point-to-point
hub and spoke
full mesh
What is a characteristic of a WAN?
WANs always use physical cables to connect LANs.
WAN service providers include carriers such as a telephone network or satellite service.
A WAN is typically owned by an enterprise which wants to interconnect its LANs.
A WAN operates inside the geographic scope of a LAN.
What are two common types of circuit-switched WAN technologies? (Choose two.)
PSTN
ISDN
ATM
DSL
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.)
Internet
public infrastructure
satellite
dedicated
private infrastructure
Which two statements describe a remote access VPN? (Choose two.)
It requires hosts to send TCP/IP traffic through a VPN gateway.
It connects entire networks to each other.
It may require VPN client software on hosts.
It is used to connect individual hosts securely to a company network over the Internet.
It requires static configuration of the VPN tunnel.
The use of 3DES within the IPsec framework is an example of which of the five IPsec building blocks?
integrity
confidentiality
nonrepudiation
Diffie-Hellman
Which type of VPN may require the Cisco VPN Client software?
MPLS VPN
site-to-site VPN
remote access VPN
SSL VPN
Which technique is necessary to ensure a private transfer of data using a VPN?
scalability
virtualization
authorization
encryption
What are the two fundamental Dynamic Multipoint VPN tunnel types? (Choose two.)
server-to-client
spoke-to-spoke
client-to-site
site-to-site
hub-to-spoke
What are two reasons a company would use a VPN? (Choose two.)
to test network connections to remote users
to allow suppliers to access the network
to connect remote users to the network
to eliminate the need of having a gateway
to increase bandwidth to the network
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
DSL connection
dial-up connection
Which VPN type is a service provider managed VPN?
Layer 3 MPLS VPN
remote access VPN
GRE over IPsec VPN
site-to-site VPN
Which IPsec framework protocol provides data integrity and data authentication, but does not provide data confidentiality?
ESP
AH
IP protocol 50
DH
What algorithm is used to provide data integrity of a message through the use of a calculated hash value?
DH
RSA
AES
HMAC
Which statement describes the effect of key length in deterring an attacker from hacking through an encryption key?
The length of a key does not affect the degree of security.
The length of a key will not vary between encryption algorithms.
The longer the key, the more key possibilities exist.
The shorter the key, the harder it is to break.
What is a type of VPN that is generally transparent to the end user?
private
remote access
public
site-to-site
