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推荐文章：思科认证考试（ＣＣＮＡ）考试模
推荐文章简介：
Questions 72. [xINx] The size of a window in a TCP segment establishes what? (Choose one.) a) The maximum number of bytes that a single frame may not exceed b) The allowable bandwidth for this TCP ses
Exam ccna(640-047)
passing score = 755
no of questions =78
time =120 minutes
date 24-11-99
I cleared the CCNA(640-047) with 92% marks.It was really a interesting experience for me.The exam was really straight forward.If you have studied the Book thoroughly and done practice exams you can get it easily.but one thing to remember you should have some practical experience that can help a lot espacially for configuration questions.
I recommend to study Todd lamlle book thoroughly .there is some command missing in this book for which u can concern ICRC book.
some of the areas of question are;
1.OSI model questions espacially related to layer functions
2.encapsulation question
information is converted into data
data into sgments
segments into pakets
packets into frames
frames into bits
3-Booting of ios
The router boot from three resourses
First from flash
then from tftp
then from rom
the syntax is
router(config)#boot system tftp ios filename tftp server address
router(config)#boot system flash ios filename
router(config)#boot system rom
there were 3-4 questions form wan technologies espacially about frame relay and isdn
fram relay dlci(use to identify the frame relay virtual circuit)
isdn (BRI-2B+!D b for data transfer and D for signiling)
you should also study TCP DOD model thorouhly.
espacially functions of LAN and WAN protocols and on which layer they work
I hope you will take advantage
hope for best for u in future
netguy
Some helpful Q&A for CCNA
1) You are reviewing a consultant's design for your 10Base2,
thin Ethernet, network. The fol
lowing distances are
outlined.
Host A to Host B is 190 meters
Host B to Host C is 160 meters
Host C to Host D is 300 meters
Which distances are too far according to the specification?
A. Host A to Host B
B. Host B to Host C
C. Host C to Host D
D. No answer is correct
Answer: A & C - The specification for 10Base2 is 185 meters
(600 feet) on coaxial cable.
2) Which window size is more efficient?
A. Window size = 3
B. Window size = 1
C. Window size = 2
D. Window size = 4
E. Window size = 5
Answer: A - The number of data segments the sender is
allowed to have outstanding before it receives and
acknowledgment is called the window. A window size of 3
allows the sender to send three data segments before
expecting an acknowledgment. A window size of 1 would
require an acknowledgment after each data segment.
3) Once data transfer is initiated between two hosts,
congestion can occur. What are two reasons for congestion?
A. A high-speed computer might be able to generate traffic
faster than the network can transfer it.
B. When datagrams arrive at a host or gateway too quickly to
process, they are stored in memory temporarily. The host or
gateway can fill its memory so that it can accept no more
datagrams.
C. Different applications can saturate the bandwidth with
larger segments than the network can handle.
D. Some applications are written with less reliability than
others are.
Answer: A & B - A high-speed computer might send traffic
faster than the network can transfer it and the host or
gateway could exhaust its buffer. The transport layer can
issue a "not ready" indicator to the s
ender so that data is
discarded.
4) You are reviewing a consultant's design for your 10Base5,
thick Ethernet, network. The following distances are
outlined.
Host A to Host B is 190 meters.
Host B to Host C is 160 meters.
Host C to Host D is 300 meters.
Host D to Host E is 600 meters.
Which distances are too far according to the specification?
A. Host A to Host B
B. Host B to Host C
C. Host C to Host D
D. Host D to Host E
Answer: D - The 10Base5 specification is 500 meters (1640
feet).
5) Put the following fields into order for an Ethernet frame
(not all of the fields belong to the Ethernet frame).
FCS
Type
Data
Preamble
SA
DA
Length
802.2 Header and Data
A. Preamble, DA, SA, Type, Data, FCS
B. Preamble, DA, SA Length, 802.2 Header and Data, FCS
C. Preamble, SA, DA, Length, Type, Data, FCS
D. Preamble, DA, SA, Type, 802.2 Header and Data. FCS
Answer: A - The Ethernet frame contains these fields:
Preamble, DA, SA, Type, Data, FCS. An 802.3 frame has the
fields of Preamble, DA, SA, Length, 802.2 Header and Data,
and FCS. Notice that it differs from an Ethernet frame with
the Length and 802.2 Header fields. The Ethernet frame has
a Type and Data field in place of the Length and 802.2
Header fields.
6) Which statement correctly defines the difference between
Ethernet II (defined by Xerox, Digital, and Intel) and IEEE
802.3?
A. The two specifications differ in their descriptions of
the datalink layer.
B. The two specifications differ in their descriptions of
the physical layer.
C. Ethernet II has MAC and LLC sublayers.
D. IEEE 802.3 ha
s MAC and LLC sublayers.
Answer: A & D - IEEE 802.3 splits out the datalink layer
into MAC and LLC sublayers.
Good luck everyone
Hello to you all.
I passed the CCNA exam today (18.10.99).
Their are 2 hours for 78 questions. The time is just enough. but it's a real tiring exam.
I tried to memorized as many questions as I could , hope it will help you.
1. What is the command to enter a console password?
2. What can you expect to come after the command banner motd?
answer: entering a password.
3. Three questions about steps of encapsulation.two of them where drag and drop, where you had to put each of the 5 steps in it's place and the fird was a strate forward question.
remember the steps are :
user information into data, data intosegments, segments into packets, packets into frames, frames into bits.
3. One drag and drop question where you had to drag the functions of the layers of the osi model into the correct layer.
4. How many bits can you borrow from a class c address for network?
a: 6
5. What are the benefits of TCP/IP protocol?
a: Connection oriented, assurance of delivery.
6. What is the purpose of Flow control?
7. You got an address and a subnet mask and you had to say what kind of address is it , tcp/ip or mac. Very eazy one.
8. What is the purpose of arp?
9. What are the benefits of isdn?
10. How do you log into EXEC mode?
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