Causes NAT table entries to be created
What does CIDR stand
for?
a. Classful IP default routing
b. Classful IP D-class routing
c. Classful interdomain routing
d. Classless IP default routing
e. Classless IP D-class routing
f. Classless interdomain routing
·
F (Classless
interdomain routing) . The word classless in this term refers to the fact that
the routes advertise a block of addresses with a mask, and can essentially
ignore the Class A, B, and C boundaries with regard to what address block is
used. Also, because the motivation was to describe routes between different
companies (different routing domains), the term uses the word interdomain.
Which of the following
summarized subnets represent routes that could have been created for CIDR's
goal to reduce the size of Internet routing tables?
a. 10.0.0.0 255.255.255.0
b. 10.1.0.0 255.255.0.0
c. 200.1.1.0 255.255.255.0
d. 200.1.0.0 255.255.0.0
·
D (200.1.0.0
255.255.0.0 ) . CIDR's original intent was to allow the summarization of
multiple Class A, B, and C networks to reduce the size of Internet routing
tables. Of the answers, only 200.1.0.0 255.255.0.0 summarizes multiple
networks.
Which of the following
are not private addresses according to RFC 1918? (Choose two answers.)
a. 172.31.1.1
b. 172.33.1.1
c. 10.255.1.1
d. 10.1.255.1
e. 191.168.1.1
·
B (172.33.1.1) and E
(191.168.1.1 ) . RFC 1918 identifies private network numbers. It includes Class
A network 10.0.0.0, Class B networks 172.16.0.0 through 172.31.0.0, and Class C
networks 192.168.0.0 through 192.168.255.0.
With static NAT,
performing translation for inside addresses only, what causes NAT table entries
to be created?
a. The first packet from the inside network to the outside network
b. The first packet from the outside network to the inside network
c. Configuration using the ip nat inside source command
d. Configuration using the ip nat outside source command
·
C (Configuration using
the ip nat inside source command) . With static NAT, the entries are statically
configured. Because the question mentions translation for inside addresses, the
inside keyword is needed in the command.
With dynamic NAT,
performing translation for inside addresses only, what causes NAT table entries
to be created?
a. The first packet from the inside network to the outside network
b. The first packet from the outside network to the inside network
c. Configuration using the ip nat inside source command
d. Configuration using the ip nat outside source command
·
A (The first packet
from the inside network to the outside network) . With dynamic NAT, the entries
are created as a result of the first packet flow from the inside network.
NAT has been
configured to translate source addresses of packets for the inside part of the
network, but only for some hosts as identified by an access control list. Which
of the following commands indirectly identifies the hosts?
a. ip nat inside source list 1 pool barney
b. ip nat pool barney 200.1.1.1 200.1.1.254 netmask 255.255.255.0
c. ip nat inside
d. ip nat inside 200.1.1.1 200.1.1.2
·
A (ip nat inside
source list 1 pool barney) . The list 1 parameter references an IP ACL, which
matches packets, identifying the inside local addresses.
Examine the following
configuration commands:
interface Ethernet0/0
ip address 10.1.1.1 255.255.255.0
ip nat inside
interface Serial0/0
ip address 200.1.1.249 255.255.255.252
ip nat inside source list 1 interface Serial0/0
access-list 1 permit 10.1.1.0 0.0.0.255
If the configuration is intended to enable source NAT overload, which of the
following commands could be useful to complete the configuration? (Choose two
answers.)
a. The ip nat outside command
b. The ip nat pat command
c. The overload keyword
d. The ip nat pool command
·
A (The ip nat outside
command) and C (The overload keyword) . The configuration is missing the
overload keyword in the ip nat inside source command and in the ip nat outside
interface subcommand on the serial interface.
Examine the following
show command output on a router configured for dynamic NAT:
-- Inside Source
access-list 1 pool fred refcount 2288
pool fred: netmask 255.255.255.240
start 200.1.1.1 end 200.1.1.7
type generic, total addresses 7, allocated 7 (100%), misses 965
Users are complaining about not being able to reach the Internet. Which of the
following is the most likely cause?
a. The problem is not related to NAT, based on the information in the command
output.
b. The NAT pool does not have enough entries to satisfy all requests.
c. Standard ACL 1 cannot be used; an extended ACL must be used.
d. The command output does not supply enough information to identify the
problem.
·
B (The NAT pool does
not have enough entries to satisfy all requests.) . The last line mentions that
the pool has seven addresses, with all seven allocated, with the misses counter
close to 1000—meaning that close to 1000 new flows were rejected because of
insufficient space in the NAT pool.
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