Chapter 09 Exam Flashcards
What is the purpose of port forwarding?
Port forwarding allows for translating inside local IP addresses to outside local addresses.
Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.
Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN.
Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.
A network administrator is configuring a static NAT on the border router for a web server located in the DMZ network. The web server is configured to listen on TCP port 8080. The web server is paired with the internal IP address of 192.168.5.25 and the external IP address of 209.165.200.230. For easy access by hosts on the Internet, external users do not need to specify the port when visiting the web server. Which command will configure the static NAT?
R1(config)# ip nat inside source static tcp 192.168.5.25 80 209.165.200.230 8080
R1(config)# ip nat inside source static tcp 209.165.200.230 80 192.168.5.25 8080
R1(config)# ip nat inside source static tcp 192.168.5.25 8080 209.165.200.230 80
R1(config)# ip nat inside source static tcp 209.165.200.230 8080 192.168.5.25 80
R1(config)# ip nat inside source static tcp 192.168.5.25 8080 209.165.200.230 80
A network engineer has configured a router with the command ip nat inside source list 4 pool corp overload. Why did the engineer use the overload option?
The company has more private IP addresses than available public IP addresses.
The company needs to have more public IP addresses available to be used on the Internet.
The company has a small number of servers that should be accessible by clients from the Internet.
The company router must throttle or buffer traffic because the processing power of the router is not enough to handle the normal load of external-bound Internet traffic.
The company has more private IP addresses than available public IP addresses.
What is defined by the ip nat pool command when configuring dynamic NAT?
the range of external IP addresses that internal hosts are permitted to access
the pool of available NAT servers
the pool of global address
the range of internal IP addresses that are translated
the pool of global address
What is the major benefit of using NAT with Port Address Translation?
It improves network performance for real-time protocols.
It provides a pool of public addresses that can be assigned to internal hosts.
It allows many internal hosts to share the same public IPv4 address.
It allows external hosts access to internal servers.
It allows many internal hosts to share the same public IPv4 address.
Which method is used by a PAT-enabled router to send incoming packets to the correct inside hosts?
It uses the source TCP or UDP port number on the incoming packet.
It uses the destination TCP or UDP port number on the incoming packet.
It uses the source IP address on the incoming packet.
It uses a combination of the source TCP or UDP port number and the destination IP address on the incoming packet.
It uses the destination TCP or UDP port number on the incoming packet.
What is the primary purpose of NAT?
conserve IPv4 addresses
allow peer-to-peer file sharing
increase network security
enhance network performance
conserve IPv4 addresses
What is a disadvantage of NAT?
There is no end-to-end addressing.
The internal hosts have to use a single public IPv4 address for external communication.
The router does not need to alter the checksum of the IPv4 packets.
The costs of readdressing hosts can be significant for a publicly addressed network.
There is no end-to-end addressing.
What are two benefits of NAT? (Choose two.)
It makes tunneling with IPsec less complicated.
It adds a degree of privacy and security to a network.
It makes troubleshooting routing issues easier.
It saves public IP addresses.
It increases routing performance.
It adds a degree of privacy and security to a network.
It saves public IP addresses.
What is an advantage of deploying IPv4 NAT technology for internal hosts in an organization?
makes internal network access easy for outside hosts using UDP
enables the easy deployment of applications that require end-to-end traceability
increases the performance of packet transmission to the Internet
provides flexibility in designing the IPv4 addressing scheme
provides flexibility in designing the IPv4 addressing scheme
A network administrator configures the border router with the command R1(config)# ip nat inside source list 4 pool corp. What is required to be configured in order for this particular command to be functional?
a VLAN named corp to be enabled and active and routed by R1
a NAT pool named corp that defines the starting and ending public IP addresses
an access list named corp that defines the private addresses that are affected by NAT
an access list numbered 4 that defines the starting and ending public IP addresses
ip nat outside to be enabled on the interface that connects to the LAN affected by the NAT
a NAT pool named corp that defines the starting and ending public IP addresses
What are two of the required steps to configure PAT? (Choose two.)
Identify the inside interface.
Define the hello and interval timers to match the adjacent neighbor router.
Define a pool of global addresses to be used for overload translation.
Define the range of source ports to be used.
Create a standard access list to define applications that should be translated.
Identify the inside interface.
Define a pool of global addresses to be used for overload translation.
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?
The request to the server for the seventh user fails.
No users can access the server.
All users can access the server.
The first user gets disconnected when the seventh user makes the request.
The request to the server for the seventh user fails.
What is a characteristic of unique local addresses?
Their implementation depends on ISPs providing the service.
They are defined in RFC 3927.
They are designed to improve the security of IPv6 networks.
They allow sites to be combined without creating any address conflicts.
They allow sites to be combined without creating any address conflicts.
Which statement describes IPv6 ULAs?
They are assigned by an ISP.
They conserve IPv6 address space.
They are not routable across the Internet.
They begin with the fe80::/10 prefix.
They are not routable across the Internet.
