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2017 Sep GED Official New Released GED-Mathematical-Reasoning
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Ethical Hacking and Countermeasures V7
Question No: 31 – (Topic 1)
The SYN flood attack sends TCP connections requests faster than a machine can process them.
->Attacker creates a random source address for each packet
->SYN flag set in each packet is a request to open a new connection to the server from the spoofed IP address
->Victim responds to spoofed IP address, then waits for confirmation that never arrives (timeout wait is about 3 minutes)
->Victim#39;s connection table fills up waiting for replies and ignores new connections
->Legitimate users are ignored and will not be able to access the server
How do you protect your network against SYN Flood attacks?
SYN cookies. Instead of allocating a record, send a SYN-ACK with a carefully constructed sequence number generated as a hash of the clients IP address, port number, and other information. When the client responds with a normal ACK, that special sequence number will be included, which the server then verifies. Thus, the server first allocates memory on the third packet of the handshake, not the first.
RST cookies – The server sends a wrong SYN/ACK back to the client. The client should then generate a RST packet telling the server that something is wrong. At this point, the server knows the client is valid and will now accept incoming connections from that client
Check the incoming packet#39;s IP address with the SPAM database on the Internet and enable the filter using ACLs at the Firewall
Stack Tweaking. TCP stacks can be tweaked in order to reduce the effect of SYN floods. Reduce the timeout before a stack frees up the memory allocated for a connection
Micro Blocks. Instead of allocating a complete connection, simply allocate a micro record of 16-bytes for the incoming SYN object
Question No: 32 – (Topic 1)
What type of port scan is shown below?
Question No: 33 – (Topic 1)
Stephanie works as a records clerk in a large office building in downtown Chicago. On Monday, she went to a mandatory security awareness class (Security5) put on by her company#39;s IT department. During the class, the IT department informed all employees that everyone#39;s Internet activity was thenceforth going to be monitored.
Stephanie is worried that her Internet activity might give her supervisor reason to write her
up, or worse get her fired. Stephanie#39;s daily work duties only consume about four hours of her time, so she usually spends the rest of the day surfing the web. Stephanie really enjoys surfing the Internet but definitely does not want to get fired for it.
What should Stephanie use so that she does not get in trouble for surfing the Internet?
Question No: 34 – (Topic 1)
Neil is a network administrator working in Istanbul. Neil wants to setup a protocol analyzer on his network that will receive a copy of every packet that passes through the main office switch. What type of port will Neil need to setup in order to accomplish this?
Neil will have to configure a Bridged port that will copy all packets to the protocol analyzer.
Neil will need to setup SPAN port that will copy all network traffic to the protocol analyzer.
He will have to setup an Ether channel port to get a copy of all network traffic to the analyzer.
He should setup a MODS port which will copy all network traffic.
Question No: 35 – (Topic 1)
In TCP communications there are 8 flags; FIN, SYN, RST, PSH, ACK, URG, ECE, CWR. These flags have decimal numbers assigned to them:
FIN = 1
SYN = 2
RST = 4
PSH = 8
ACK = 16
URG = 32
ECE = 64
CWR = 128
Jason is the security administrator of ASPEN Communications. He analyzes some traffic using Wireshark and has enabled the following filters.
What is Jason trying to accomplish here?
SYN, FIN, URG and PSH
SYN, SYN/ACK, ACK
RST, PSH/URG, FIN
ACK, ACK, SYN, URG
Question No: 36 – (Topic 1)
Jayden is a network administrator for her company. Jayden wants to prevent MAC spoofing on all the Cisco switches in the network. How can she accomplish this?
Jayden can use the commanD. ip binding set.
Jayden can use the commanD. no ip spoofing.
She should use the commanD. no dhcp spoofing.
She can use the commanD. ip dhcp snooping binding.
Question No: 37 – (Topic 1)
Peter extracts the SID list from Windows 2008 Server machine using the hacking tool
quot;SIDExtracterquot;. Here is the output of the SIDs:
From the above list identify the user account with System Administrator privileges?
Question No: 38 – (Topic 1)
What is the problem with this ASP script (login.asp)?
The ASP script is vulnerable to Cross Site Scripting attack
The ASP script is vulnerable to Session Splice attack
The ASP script is vulnerable to XSS attack
The ASP script is vulnerable to SQL Injection attack
Question No: 39 – (Topic 1)
Google uses a unique cookie for each browser used by an individual user on a computer. This cookie contains information that allows Google to identify records about that user on its database. This cookie is submitted every time a user launches a Google search, visits a site using AdSense etc. The information stored in Google#39;s database, identified by the cookie, includes
->Everything you search for using Google
->Every web page you visit that has Google Adsense ads
How would you prevent Google from storing your search keywords?
Block Google Cookie by applying Privacy and Security settings in your web browser
Disable the Google cookie using Google Advanced Search settings on Google Search page
Do not use Google but use another search engine Bing which will not collect and store your search keywords
Use MAC OS X instead of Windows 7. Mac OS has higher level of privacy controls by default.
Question No: 40 – (Topic 1)
How many bits encryption does SHA-1 use?
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