Dutch team up with Armenia for Bredolab botnet take down

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Dutch team up with Armenia for Bredolab botnet take down

Dutch team up with Armenia for Bredolab botnet take down

Posted: 26 Oct 2010 09:00 AM PDT


Armenian authorities arrested a 27-year-old man on Tuesday on suspicion of running a large botnet that was dismantled after a unique take-down operation by Dutch law enforcement and computer security experts on Monday.

SecTor 2010: Why security is the enemy of privacy

Posted: 26 Oct 2010 09:00 AM PDT


Some might expect security to be the answer for privacy protection, but it's often part of the problem. Tracy Ann Kosa, a privacy impact assessment specialist with the government of Ontario, explains why at SecTor 2010.

Intego highlights iOS 4.1 iPhone security flaw

Posted: 26 Oct 2010 09:00 AM PDT


A new iOS 4.1 flaw has been spotted that could compromise Apple iPhone users.

Skeptical Shopper: E-Coupons May Track Spending Habits

Posted: 26 Oct 2010 09:00 AM PDT


The advent of online coupons has made shopping and saving that much easier. In an earlier era, people spent their Sunday mornings clipping coupons out of the newspaper. Now, you can download coupons from dedicated sites like Coupons.com or Ebates.com, or even social networking sites like Facebook and LinkedIn. But this convenience carries certain privacy risks: Some companies track consumer spending habits based on the coupons those consumers use.

WaveSecure

Posted: 26 Oct 2010 09:00 AM PDT


Losing your Android phone, whether accidentally or through theft, is one of the easiest ways to become a victim of identity theft. Suddenly, handy features such as your integrated e-mail, contacts, and calendar can be used against you by strangers. Although Android phones have built-in security functions (go to the Settings menu and select Security) such as the ability to lock the phone and require a password after a specified period of inactivity, many people disregard them because it's a little less convenient to have to unlock the phone with each use.

Fix a Windows Infection Using Linux

Posted: 25 Oct 2010 09:00 AM PDT


If you use Linux on your company's desktop or server computers, you're already familiar with many of the security advantages the open source operating system offers over its Windows and Mac rivals. What many people don't realize, however, is that Linux can also be used to rescue a computer that has been crippled by malware.

CCNA 4 Chapter 8

Posted: 26 Oct 2010 06:46 AM PDT


1. What combination of IP address and wildcard mask should be used to specify only the last 8 addresses in the subnet 192.168.3.32/28?
192.168.3.32 0.0.0.7
192.168.3.32 0.0.0.15
192.168.3.40 0.0.0.7
192.168.3.40 0.0.0.15

2. Excessive broadcasts are generally a symptom of a problem at which layer?
physical
data link
network
transport


3.

Refer to the exhibit. Which three pieces of information can be determined by analyzing the output shown? (Choose three.)
A carrier detect signal is present.
Keepalives are being received successfully.
Default encapsulation is used on this serial link.
Packets passing this interface cannot exceed 1 KB in size.
The reliability of this link is very low.
The LCP negotiation phase is complete.

4. A network administrator has received complaints that users on a local LAN can retrieve e-mail from a remote e-mail server but are unable to open web pages on the same server. Services at which two layers of the OSI model should be investigated during the troubleshooting process? (Choose two.)
physical layer
data link layer
network layer
transport layer
application layer

5. When gathering symptoms for troubleshooting a network problem, which step could result in getting an external administrator involved in the process?
narrowing the scope
gathering symptoms from suspect devices
analyzing existing symptoms
determining ownership


6. Encapsulation errors from mismatched WAN protocols on a serial link between two routers indicate a problem at which OSI layer?
physical
data link
network
transport

7.

Refer to the exhibit. Users at Branch B are reporting trouble accessing a corporate website running on a server that is located at HQ. HQ and Branch A users can access the website. R3 is able to ping 10.10.10.1 successfully but not 10.10.10.2. The users at Branch B can access servers at Branch A. Which two statements are true aboutthe troubleshooting efforts? (Choose two.)
The web server should be tested for an application layer problem.
Frame Relay at R3 and R2 should be tested to narrow the scope of the problem.
The fact that users at Branch A are working normally proves that there is no problem at R2.
An ACL entry error could cause the failure at Layer 4 in either R3 or R2.
The successful ping from R3 to R1 proves that the WAN is functioning normally. Therefore, the problem has to be in the upper layers.

8. Which troubleshooting approach is suggested for dealing with a complex problem that is suspected of being caused by faulty network cabling?
bottom up
top down
divide and conquer
middle out

9. Users are complaining of very long wait times to access resources on the network. The show interface command reveals collision counts far above the network baseline. At which OSI layer should the administrator begin troubleshooting?
application
transport
network
data link
physical

10.

Refer to the exhibit. Users on the Internal LAN are unable to connect to the www server. The network administrator pings the server and verifies that NAT is functioning correctly. Which OSI layer should the administrator begin to troubleshoot next?
physical
data link
network
application

11. Which two statements are true concerning logical networking models? (Choose two.)
TCP/IP splits the lowest layer of the OSI model into two separate layers.
The top layer of the TCP/IP model combines the functions of the top three OSI layers.
Troubleshooting with the TCP/IP model requires different techniques than with the OSI model.
The network access layer is responsible for exchanging packets between devices on a TCP/IP network.
The Internet layer provides communication between applications, such as FTP, HTTP, and SMTP on separate hosts.
The TCP/IP network access layer corresponds to the OSI physical and data link layers.

12.

Refer to the exhibit. Which two steps should be taken during the process of creating network documentation? (Choose two.)
Record the information about the devices discovered in the Campus network only.
Record the information about the devices discovered in the entire network, including the remote locations.
Transfer any information about the devices from the network configuration table that corresponds to a component of the topology diagram.
Transfer only the Layer 2 and Layer 3 information about the devices from the network configuration table that corresponds to a component of the topology diagram.
Transfer the recorded information about the devices from the network configuration table gathered during peak network utilization that corresponds to a component of the topology diagram.

13. What is one example of a physical layer problem?
incorrect encapsulation
incorrect STP configuration
incorrect ARP mapping
incorrect clock rate

14. Clients across the company are reporting poor performance across all corporate applications running in the data center. Internet access and applications running across the corporate WAN are performing normally. The network administrator observes a continual broadcast of random meaningless traffic (jabber) on the application server LAN in the data center on a protocol analyzer. How should the administrator start troubleshooting?
The jabber in the data center indicates a local physical layer problem. Use the protocol analyzer to determine the source of the jabber, and then check for a recent NIC driver update or bad cabling.
Because all clients are experiencing application problems, the administrator should use a top-down approach with the application servers in the data center.
The scope of the problem indicates a likely routing or spanning-tree problem. Begin by checking routing tables, and follow up using appropriate STP show commands to find a loop if routing is working normally.
Poll the staff to determine if any recent changes have been made. Back out all the changes one by one until the error condition is fixed.

15. A technician has been asked to make several changes to the configuration and topology of a network and then determine the outcome of the changes. What tool can be used to determine the overall effect caused by the changes?
baselining tool
knowledge base
protocol analyzer
cable tester

16. A technician has been asked to troubleshoot an existing switched network but is unable to locate documentation for the VLAN configuration. Which troubleshooting tool allows the technician to map and discover VLAN and port assignments?
cable analyzer
network analyzer
protocol analyzer
knowledge base

17. Which two pieces of information are typically found on a logical network diagram? (Choose two.)
cable types
connector types
interface identifiers
DLCI for virtual circuits
operating system versions

18. Which two components should be taken into consideration when establishing a network baseline? (Choose two.)
information about the network design
IP addressing allocation on the network
requirements about the service provider setup
requirements for access control lists to regulate traffic
expected performance under normal operating conditions

19. Which three approaches should be used when attempting to gather data from users for troubleshooting? (Choose three.)
Determine fault.
Get to know the user to build trust.
Obtain information by asking simple pertinent questions.
Impress the user with use of technical language and skills.
Determine if the problem is related to time or a specific event.
Determine if the user can re-create the problem or events leading to the problem.

20. Information about which OSI layers of connected Cisco devices can be verified with the show cdp neighbors command?
All layers
Layer 1, Layer 2, and Layer 3
Layer 1, Layer 2, Layer 3, and Layer 4
Layer 6 and Layer 7

New Attack Disguised as DHL Parcel Delivery Notice

Posted: 25 Oct 2010 09:00 AM PDT


Some malware attacks are exceedingly clever and innovative, while others just rely on tried and true techniques that are fairly reliable no matter how much users are told to avoid them. AppRiver is reporting a new threat that falls into this latter category--a fake DHL shipping receipt designed with a malicious file attachment.

Firefox Add-on Firesheep Brings Hacking to the Masses

Posted: 25 Oct 2010 09:00 AM PDT


Want to hack someone else's Amazon, Facebook, Twitter or Windows Live account in just one click? A Firefox extension called Firesheep claims you can by hijacking a person's current user session over an open Wi-Fi connection.

Remains of the Day: Open mouth, insert foot

Posted: 25 Oct 2010 09:00 AM PDT


The best thing about the "open" philosophy Google endorses so vehemently? There's always somewhere to stick your foot: let CEO Eric Schmidt demonstrate. Elsewhere, Melinda Gates dishes on Apple products in her household, Steve Jobs crushes the dreams of many an iPad user, and Apple's tablet is Hollywood's latest darling. We're live with the remainders for Monday, October 25, 2010 in 3...

Extreme’s latest Gigabit Ethernet switch ups ante with Cisco, Juniper

Posted: 26 Oct 2010 09:00 AM PDT


Extreme Networks Tuesday rolled out an Ethernet switch line designed to play a series of roles, including edge aggregation in the campus and top-of-rack server access in the data center.

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