Quản trị mạng Chapter10
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Nguyen Tu Anh - Take Exam
Exam questions
Time remaining: 00: 09: 32
1 . What command would you use to define a global address pool?
ip local-pool
ip address-pool
ip global-pool
ip global pool
2 . When the following configuration is present on the router, how many addresses will be available for dynamic NAT translation? ip
nat pool test 192.168.1.33 192.168.1.42 netmask 255.255.255.224 ip nat inside source list 7 pool test
7
9
10
31
3 . What is happening here is that the two hosts are on different networks on other sides of the NAT router. However, both networks
happen to be using the same RFC 1918 private network addresses. The NAT router takes the host address 10.0.0.1 from inside my
network and translates it to 222.2.2.1. The NAT router takes the host address 10.0.0.1 from outside my network and translates it to
111.1.1.1. So, from this diagram you can see how the Inside Local addresses are addresses inside my network and the Inside Global
addresses are translated to addresses outside of my network (and they must be translated back to get back inside my network). The
Outside Global addresses are on another network and are legitimate outside of my network. They are translated to Outside Local
addresses, which are legitimate inside of my network. When using a Cisco 700 router, a ping from an outside host:
will not work with the Cisco 700 router
will reach the host destination IP address
will end at the router because end-to-end connectivity testing isn’t possible with the Cisco 700 router
will loop endlessly
4 . Which command would you use to show and verify NAT configuration and statistics?
show ip nat
show ip nat translation
show nat
show nat translation
5 . Which are examples of protocol translation? Choose two.
Connect via TN3270, then telnet to the destination
Connect to an access server using telnet, then use LAT
Connect to an access server using telnet, then use telnet to another host
Connect to an access server using PPP, then use CHAP to authenticate
6 . Which of the following services are provided by Cisco NAT? Choose two.
Static address translation
Domain name resolution
IP to MAC address resolution
TCP load balancing
7 . Which of the following are disadvantages of NAT (Network Address Translation)? Choose three.
Overlap dysfunction
Conservation of IP addresses
Latency
Accountability
Functionality
8 . Which two services are available through Cisco NAT?
TCP load distribution
Domain lookup
Address Resolution
Static address translation
Specific address filtration
9 . What process normally occurs when you use dynamic NAT?
Your address is always translated to the same address
Your address is dynamically chosen from a pool of available addresses
Your address is never translated
Your address is always translated to a different address
10 . What usually occurs when you use static NAT?
Your IP address is incremented each time
Your IP address is always translated to the same address
Your IP address is always translated to a different address
Your IP address is dynamically chosen through an address pool
11 . What is used in an extended access list but not in a standard access list?
Source hostname IP address and subnetmask
Destination port information
Session layer information
Source network IP address and subnetmask
12 . Read and answer the question?
A
B
C
D
13 . Which of the following is an example of protocol translation?
LAT to Telnet
Telnet to Telnet
PAP to CHAP
Ethernet to IP
14 . What happens when the command “clear ip nat translation *” is entered on a router?
Clears all existing NAT translation table entries and NAT is suspended.
Clears dynamic NAT translation table entries and NAT resumes.
Clears static NAT translation entries and NAT resumes.
Clears all inactive NAT translation entries and NAT is suspended.
15 . How does NAT allow for more hosts than there are available IP addresses?
Never using the same address twice
Modifying TCP port numbers
Manipulating the IP authentication field
Restricting the number of hosts allowed to communicate on the network simultaneously
16 . Which of the following is an example of Cisco protocol translation?
translate ip 172.21.3.4 lat x25 123555222
translate ip lat 172.21.3.4 vax11
translate ip lat 172.21.3.4 x25 1235552222
translate tcp 172.21.3.4 x25 1235552222
17 . Which three functions does PAT provide for Cisco 700 series routers?
Address translations
Remote host location on behalf of local clients
IP address conservation
Firewall protection by hiding local clients
Downloads configuration to local clients
18 . What are three functions that PAT (Port Address Translation) provides?
Address translation
IP address conservation
Firewall Service
IP address resolution
19 . Overload occurs when NAT experiences:
No more static address translations
Messages too fast for the console to handle
More hosts than available addresses
Excessive CPU utilization
20 . Read and answer the question.
A
B
C
D
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