Pass4sure 350-018 CCIE
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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,
Exam Number/Code: 350-018
Exam Name: CCIE Pre-Qualification Test for Security
“CCIE Pre-Qualification Test for Security”, also known as 350-018 exam, is a Cisco certification.
Preparing for the 350-018 exam? Searching 350-018 Test Questions, 350-018 Practice Exam, 350-018 Dumps?
With the complete collection of questions and answers, Pass4sure has assembled to take you through 220 Q&As to your 350-018 Exam preparation. In the 350-018 exam resources, you will cover every field and category in CCIE helping to ready you for your successful Cisco Certification.
Questions and Answers : 220 Q&As
Updated: 2008-07-30
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