Testking cisco 642-054
Vendor: cisco
Exam Code: 642-054
Exam Name: RSSSE Routing and Switching Solutions for Systems Engineers (Access Routing and LAN Switching )
cisco 642-054 value pack
642-054 Q & A with Explanations + 642-054 Study Guide + 642-054 Preparation Labs
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Question: 1.
Which addresses below would be valid IP addresses of hosts on the Internet? (Multiple answer)
A. 235.1.1.1
B. 223.20.1.1
C. 10.100.1.1
D. 127.0.0.1
E. 24.15.1.1
Answer: B, E
Explanation:
When you create an internal network, we recommend you use one of the following address
groups reserved by the Network Working Group (RFC 1918) for private network addressing:
Class A: 10.0.0.0 to 10.255.255.255
Class B: 172.16.0.0 to 172.31.255.255
Class C: 192.168.0.0 to 192.168.255.255
Class D address start with the 1110 bit so the 223.20.1.1 is a legal class C address
Question: 2.
On an Ethernet LAN, a jam signal causes a collision to last long enough for all other nodes to
recognize that:
A. A collision has occurred and all nodes should stop sending.
B. Part of a hash algorithm was computed, to determine the random amount of time the nodes
should back off before retransmitting.
C. A signal was generated to help the network administrators isolate the fault domain between
two Ethernet nodes.
D. A faulty transceiver is locked in the transmit state, causing it to violate CSMA/CD rules.
E. A high-rate of collisions was caused by a missing or faulty terminator on a coaxial Ethernet
network.
Answer: A
Explanation:
When a collision is detected the device will “transmit a jam signal” this will will inform all the
devices on the network that there has been a collision and hence stop them initiating the
transmission of new data. This “jam signal” is a sequence of 32 bits that can have any value as
long as it does not equal the CRC value in the damaged frame’s FCS field. This jam signal is
normally 32 1’s as this only leaves a 1 in 2^32 chance that the CRC is correct by chance.
Because the CRC value is incorrect all devices listening on the network will detect that a collision
has occurred and hence will not create further collisions by transmitting immediately. “Part of a
hash algorithm was computed, to determine the random amount of time the nodes should back
off before retransmitting.” WOULD SEEM CORRECT BUT IT IS NOT After transmitting the jam
signal the two nodes involved in the collision use an algorithm called the “truncated BEB
(truncated binary exponential back off)” to determine when they will next retransmit. The
algorithm works as follows: Each device will wait a multiple of 51.2us (minimum time required for
signal to traverse network) before retransmitting. 51.2us is known as a “slot”. The device will wait
wait a certain number of these time slots before attempting to retransmit. The number of time
slots is chosen from the set {0,…..,2^k-1} at random where k= number of collisions. This means k
is initialized to 1and hence on the first attempt k will be chosen at random from the set {0,1} then
on the second attempt the set will be {0,1,2,3} and so on. K will stay at the value 10 in the 11, 12,
13, 14, 15 and 16th attempt but on the 17th attempt the MAC unit stops trying to transmit and
reports an error to the layer above.
Question: 3.
Which statements about TACACS+ are true? (multiple answer)
A. If more than one TCACS+ server is configured and the first one does not respond within a
given timeout period, the next TACACS+ server in the list will be contacted.
B. The TACACS+ server’s connection to the NAS encrypts the entire packet, if a key is used at
both ends.
C. The TACACS+ server must use TCP for its connection to the NAS.
D. The TACACS+ server must use UDP for its connection to the NAS.
E. The TACACS+ server may be configured to use TCP of UDP for its connection to the NAS
Answer: A, B, C
Explanation:
PIXFirewall permits the following TCP literal names: bgp, chargen, cmd,daytime, discard, domain,
echo, exec, finger, ftp, ftp-data, gopher, h323,hostname, http, ident, irc, klogin, kshell, lpd, nntp,
pop2, pop3, pptp,rpc, smtp, sqlnet, sunrpc, TACACS, talk, telnet, time, uucp, whois, and www. To
specify a TACACS host, use the tacacs-server host globalconfiguration command. Use the no
form of this command to delete thespecified name or address. timeout= (Optional) Specify a
timeout value. This overrides the global timeout value set with the tacacs-server timeout
command for this serveronly. tacacs-server key To set the authentication encryption key used for
all TACACS+ communicationsbetween the access server and the TACACS+ daemon, use the
tacacs-server keyglobal configuration command. Use the no form of this command to disable the
key. key = Key used to set authentication and encryption. This key must match the key used on
the TACACS+ daemon.
Question: 4.
A Network Administrator is trying to configure IPSec with a remote system. When a tunnel is
initiated from the remote end, the security associations (SAs) come up without errors. However,
encrypted traffic is never send successfully between the two endpoints. What is a possible
cause?
A. NAT could be running between the two IPSec endpoints.
B. A mismatched transform set between the two IPSec endpoints.
C. There is a NAT overload running between the two IPSec endpoints.
D. Mismatched IPSec proxy between the two IPSec endpoints.
Answer: C
Explanation:
This configuration will not work with port address translation (PAT). Note: NAT is a one-to-one
address translation, not to be confused with PAT, which is a many (inside the firewall)-to-one
translation. IPSec with PAT may not work properly because the outside tunnel endpoint device
cannot handle multiple tunnels from one IP address. You will need to contact your vendor to
determine if the tunnel endpoint devices will work with PAT Question- What is PAT, or NAT
overloading? Answer- PAT, or NAT overloading, is a feature of Cisco IOS NAT and can be used
to translate internal (inside local) private addresses to one or more outside (inside global—usually
registered) IP addresses. Unique source port numbers on each translation are used to distinguish
between the conversations. With NAT overload, a translation table entry containing full address
and source port information is created.
Question: 5.
Which are the principles of a one way hash function? (Multiple answer)
A. A fixed length output is created from a variable length input by a hash function.
B. A hash function cannot be random and the receiver cannot decode the hash.
C. A hash function is usually operated in an IPSec environment to provide a fingerprint for a
packet.
D. A hash function must be easily decipherable by anyone who is listening to the exchange.
Answer: A, C
Explanation:
Developers use a hash function on their code to compute a diges, which is also known as a oneway
hash .The hash function securely compresses code of arbitrary length into a fixed-length
digest result.
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