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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.
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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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Pass4sure > Cisco > CCIE > Exam 350-018
CCIE Pre-Qualification Test for Security : 350-018 Exam
Pass4sure 640-802 Exam Questions
* Updated: October 30th , 2008
* Price: $599.98
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Product Description
Exam Number/Code: 350-018
Exam Name: 350-018 Value Pack
Our technical expert highly recommend that you buy this “350-018 written exam+350-018-Lab exam” value pack. To be certified as a CCIE, you must pass two sequence of exams: written exam and Lab exam respectively.
In order that candidates will better grasp the CCIE knowledge, our technical experts outline the examination topics and compile a set of CCIE Preparation kits, which not only covers all the main and important CCIE knowledge, but also builds the Q&As and Labs for corresponding exam separately. With mastering both of them, you will surely have a thorough understanding of CCIE knowledge. Value pack is surely the best choice for you to pass 350-018 with high scores.
But here we must notice one thing: Regarding this Value Pack, the guarantee policy will only be available for 350-018 written exam but not cover 350-018-Lab exam. If you buy the Value Pack but failed 350-018 written exam, we will carry out the guarantee policy strictly, however, we do not supply pass guarantee for 350-018-Lab exam because of its particularity(Please refer to the description of 350-018-Lab).
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* Questions and Answers : 329 Q&As
* Updated: October 30th , 2008
* Price: $125.99$99.99
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CCIE Pre-Qualification Test for Security(Written exam)
“CCIE Pre-Qualification Test for Security”, also known as 350-018 exam, is a Cisco certification. With the complete collection of questions and answers, Pass4sure has assembled to take you through 329 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.
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CCIE Pre-Qualification Test for Security (Lab exam)
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Feedbacks
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I cleared CCIE Security written with score of 94 %. I read the CCIE security from cisco press (Henry Benjamin) and some cisco references (protocols) at cisco.com.
I used CCIE security official guide from Henry Benjamin but that’s not sufficient for this exam – you need to know various attack types. Good amount of questions on IPSEC.
Its a long way to reach the goal yet.
* — Vinni (Oct, 16 2008)
*
The questions are 100, and the pass mark is 70. Questions are from security protocol, application protocol, general networking, security technology, cisco security applications, security general and cisco genral.
I wrote the exam yesterday and scored 94%.
Aside from the years of experience I av, I read henry benjamin study guide, knowledgenet, network security achitecture, designing cisco network security and a host of others.
I also used p4sure for practice.
All you need do is to read the recommended books and practice d dumps.
* — Royal (Oct, 11 2008)
Comment by cisco — November 5, 2008 @ 8:55 pm
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