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71 Cisco routers use wildcard
masking to identify how to check or ignore corresponding IP
address bits. What does setting a wildcard mask bit to 0 cause
the router to do?
A. It tells the router to check the corresponding bit value.
B. It tells the router to ignore the corresponding bit value.
C. It tells the router to check its alternate routing list.
D. It tells the router to use its primary routing list.
Ans A
It tells the router to check the corresponding bit value.
72 You are a system administrator and you want to deny access
to a group of computers with addresses 172.30.16.0 to
172.30.31.0. Which wildcard mask would you use?
A. 0.0.15.255
B. 0.0.255.255
C. 0.0.31.255
D. 0.0.127.255
E. 0.0.255.255
Ans: A
0.0.15.255 will check the last 13 bits of an address so that
computers 172.30.16.0 to 172.30.31.0 will be denied access.
0.0.31.255 would check the last 6 binary digits and deny access
to addresses 172.30.32.0 to 172.30.63.0. 0.0.127.255 would check
the last 7 binary digits and deny access to addresses
172.30.64.0 to 172.30.127.0. 0.0.255.255 would deny 172.30.0.0
to 172.30.254.0. If you write decimal 15 in binary, you have
0001111, the 1's tell the router to ignore address with these
bits set; 0's tell the router to check the bits. The third octet
for 172.30.16.0 is 00010000. The third octet for 172.30.31.0
would be 00011111. So, traffic from these addresses would be
denied.
73 In order to limit the quantity of numbers that a system
administrator has to enter, Cisco can use which abbreviation to
indicate 0.0.0.0?
A. host
B. any
C. all
D. include
Ans: A
Cisco uses host to specify 0.0.0.0. This tells the router to
check all. Cisco uses any to specify 255.255.255.255. This tells
the router to ignore all and permit any address to use an access
list test.
74 What do the following commands accomplish?
access-list 1 permit 172.16.0.0 0.0.255.255
interface ethernet 0
IP access-group 1 out
interface ethernet 1
IP access-group 1 out
A. Only traffic from the source network 172.16.0.0 will be
blocked.
B. Only traffic from the source network 172.16.0.0 will be
forwarded. Non-172.16.0.0 network traffic is blocked.
C. Non-172.16.0.0 traffic will be forwarded.
D. All traffic will be forwarded.
Ans: B
Only traffic from the source network 172.16.0.0 will be
forwarded. Non-172.16.0.0 network traffic is blocked. The
wildcard mask 0.0.255.255 tells the router to check the first 2
octets and to ignore the last 2 octets.
75 When using access lists, it is important where those
access lists are placed. Which statement best describes access
list placement?
A. Put standard access lists as near the destination as
possible. Put extended access lists as close to the source as
possible.
B. Put extended access lists as near the destination as
possible. Put standard access lists as close to the source as
possible.
C. It isn't import where access lists are placed since the
router will read and cache the whole list.
D. Put access lists as close to corporate headquarters as
possible.
Ans A
Put standard access lists as near the destination as possible.
Put extended access lists as close to the source as possible.
Standard access lists don't specify the destination address.
76 As the system administrator, you enter the following
commands at the command prompt:
ipx routing
access-list 800 permit 2b 4d
int e0
ipx network 4d
ipx access-group 800 out
int e1
ipx network 2b
int e2
ipx network 3c
What did these command accomplish?
A. Traffic from network 4c destined for network 4d will be
forwarded out Ethernet0.
B. Traffic from network 3c destined for network 4d will be
forwarded out Ethernet0.
C. Traffic from network 2b destined for network 4d will be
forwarded out Ethernet0.
D. Traffic from network 4d destined for network 2d will be
forwarded out Ethernet0.
Ans C
Traffic from network 2b destined for network 4d will be
forwarded out Ethernet0. The other interfaces E1 and E2 are not
subject to the access list since they lack the access group
statement to link them to access list 800.
78 The following commands were entered at the command prompt
of a Cisco router. What do they accomplish?
access-list 1000 deny 9e.1234.5678.1212 4
access-list 1000 permit -1
interface ethernet 0
ipx network 9e
interface ethernet 1
ipx network 4a
interface serial 0
ipx network 1
ipx output-sap-filter 1000
A. File server advertisements from server 9e.1234.5678.1212
will not be forwarded on interface S0.
B. All other SAP services, other than file server, from any
source will be forwarded on S0.
C. All other SAP services, other than print server, from any
source will be forwarded on S0.
D. Print server advertisements from server 9e.1234.5678.1212
will not be forwarded on interface S0.
Ans A & B
File server advertisements from server 9e.1234.5678.1212 will
not be forwarded on interface S0. All other SAP services, other
than file server, from any source will be forwarded on S0.
79 You receive "input filter list is 800 and output filter
list is 801" as part of the output from a show interfaces
command. What kind of traffic are you filtering?
A. IPX/SPX
B. TCP/IP
C. LocalTalk
D. DDR
Ans: A
Because the access list is numbered in the 800 range, you are
filtering IPX/SPX traffic.
80 Which service uses telephone control messages and signals
between the transfer points along the way to the called
destination?
A. Signaling System 7 (SS7)
B. Time-division Multiplexing (TDM)
C. X.25
D. Frame relay
Ans: A
Signaling System 7 (SS7) uses telephone control messages and
signals between the transfer points along the way to the called
destination. Time-division Multiplexing (TDM) has information
from multiple sources and allocates bandwidth on a single media.
Circuit switching uses signaling to determine the call route,
which is a dedicated path between the sender and the receiver.
Basic telephone service and Integrated Services Digital Network
(ISDN) use TDM circuits. X.25 and Frame Relay services have
information contained in packets or frames to share
non-dedicated bandwidth. X.25 avoids delays for call setup.
Frame Relay uses permanent virtual circuits (PVCs).
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