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قديم 05-01-2011, 09:07 AM   #4
ozy026
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تاريخ التسجيل: Jan 2011
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Question رد: اذاكر من اى امتحان

اقتباس:
المشاركة الأصلية كتبت بواسطة اصنع مجد مصر مشاهدة المشاركة
Refer to the exhibit. What is the correct addressing for a frame and packet received by Host B from Host A?



انقر على الصورة لعرضها في الحجم الكامل.

انقر على الصورة لعرضها في الحجم الكامل.
A. Destination MAC: 0011.43da.2c98Source MAC: 0070.0e8f.088aDestination IP: 192.168.60.5Source IP: 192.168.24.5
B. Destination MAC: 0011.43da.2c98Source MAC: 00b0.d0ef.5f6aDestination IP: 192.168.60.5Source IP: 192.168.24.5
C. Destination MAC: 0011.43da.2c98Source MAC: 0070.0e8f.088aDestination IP: 192.168.60.5Source IP: 192.168.60.1
D. Destination MAC: 0011.43da.2c98Source MAC: 0070.0e97.af4eDestination IP: 192.168.60.5Source IP: 192.168.60.2
Answer: A


Refer to the graphic. Workstation A in the Sales location is communicating with the server in the Production location. What will be the source MAC address of the frames received by workstation A from the server?
انقر على الصورة لعرضها في الحجم الكامل.
A. the MAC address of router interface e1
B. the MAC address of host A
C. the MAC address of the server network interface
D. the MAC address of router interface e0
Answer: D




Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission?
انقر على الصورة لعرضها في الحجم الكامل.


انقر على الصورة لعرضها في الحجم الكامل.

A. A
B. B
C. C
D. D
E. E
F. F
Answer: D



In the network below, host PC-A is transferring a file to the FTP server. Point A represents theframe as it goes toward router1. What will the Layer 2 destination address be at this point?
انقر على الصورة لعرضها في الحجم الكامل.


A. abcd.2246.0035 B. 192.168.1.1
C. 192.168.7.17
D. abcd.1123.0045
Answer: A


Refer to the exhibit. Host A needs to send data to Host B. Which Layer 2 and Layer 3 destination addresses will be used to send the data from Host A to Host B?
انقر على الصورة لعرضها في الحجم الكامل.
A. 192.168.24.2 and 0007.0e84.acef
B. 192.168.60.5 and 0007.0e56.ab2e
C. 192.168.60.5 and 0011.43da.2c98
D. 192.168.24.1 and 0007.0e56.ab2e
Answer: B


Refer to the exhibit. Host A is to send data to Host B. How will ROUTER1 handle the data frame received from Host A? (Choose three.)
انقر على الصورة لعرضها في الحجم الكامل.
A. ROUTER1 will strip off the destination MAC address and replace it with the MAC address ofHost BB. ROUTER1 will strip off the source IP address and replace it with the IP address on theforwarding FastEthernet interface.
C. ROUTER1 will forward the data frame out interface FastEthernet0/2.
D. ROUTER1 will strip off the source MAC address and replace it with the MAC address on theforwarding FastEthernet interface.
Answer: A,C,D
انا مش هاقدر اشرح لك لانى مش بعرف أشرح والله
بس دى معلومات عن arp cache
وعلى فكرة المسائل سهلة مش صعبة بس انته ركز فيها شوية وهاتفهم الكاش بيعمل اية ؟!
[B]

The Address Resolution Protocol (ARP) cache is a table that saves mappings between Network Layer (Layer 3) and Data Link Layer (Layer 2) addresses. The Network Layer contains the Internet Protocol (IP) addresses, while the Data Link Layer contains the Media Access Control (MAC) addresses.

Each system employing the ARP protocol uses this cache of recent mappings to minimize the number of ARP requests. The Operating System stores the cache in Random Access Memory (RAM).

Sometimes, the Microsoft Windows ARP cache becomes corrupted and has to be cleared. The first sign that may be noticed is that connections to the Internet will time out and fail.
Viewing the ARP Cache

To take a look at the ARP cache, go to the start menu and click on Run. In the Command line interface, type command: C:\>arp -a
Clearing the ARP Cache

To solve this issue, the ARP cache has to be cleared. This is performed with the command: C:\>netsh interface ip delete arpcache. Then click OK.
If Clearing Fails

There are times when the ARP cache cannot work properly because of a bug in Microsoft Windows. At these instances, a system error message appears. The bug happens when Routing and Remote Services are allowed. These services have almost no use and can be disabled.

To disable Routing and Remote Services:
Click the Start button of the Windows Explorer. Go to the Control Panel.
If it is in Category view, switch to Classic View. Then, click the Administrative Tools link.
Double-click the Computer Management link.
Double-click Services and Applications and give another double-click to Services.
Double-click Routing and Remote Services.
Set the Startup Type to Disabled (options are Manual, Automatic, and Disabled)
Click the Stop button for the Service Status.
Hit the OK button to save the changes.

Then, clear the ARP cache once more. The ARP should be full without any error messages.
How Can the ARP Cache Help?

Whatever IP device is currently being used, it will have an ARP cache. This will be utilized in the troubleshooting of network connectivity. If all things are going smooth for ARP, there will be a dynamic ARP entry, with IP and MAC values. If the ARP entry is not complete, the ARP cache can be cleared, then another communication can be attempted[/B
].
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