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A Company security System Administrator is reviewing the network system log files. He notes the following: What should he assume has happened and what should he do about the situation?
A. He should contact the attacker’s ISP as soon as possible and have the connection disconnected.
B. He should log the event as suspicious activity, continue to investigate, and take further steps according to site security policy.
C. He should log the file size, and archive the information, because the router crashed.
D. He should run a file system check, because the Syslog server has a self correcting file system problem.
E. He should disconnect from the Internet discontinue any further unauthorized use, because an attack has taken place.
400-051 exam Correct Answer: B
You should never assume a host has been compromised without verification. Typically, disconnecting a server is an extreme measure and should only be done when it is confirmed there is a compromise or the server contains such sensitive data that the loss of service outweighs the risk. Never assume that any administrator or automatic process is making changes to a system. Always investigate the root cause of the change on the system and follow your organizations security policy.
To what does “message repudiation” refer to what concept in the realm of email security?
A. Message repudiation means a user can validate which mail server or servers a message was passed through.
B. Message repudiation means a user can claim damages for a mail message that damaged their reputation.
C. Message repudiation means a recipient can be sure that a message was sent from a particular person.
D. Message repudiation means a recipient can be sure that a message was sent from a certain host.
E. Message repudiation means a sender can claim they did not actually send a particular message.
Correct Answer: E
A quality that prevents a third party from being able to prove that a communication between two other parties ever took place. This is a desirable quality if you do not want your communications to be traceable.
Non-repudiation is the opposite quality–a third party can prove that a communication between two other parties took place. Non-repudiation is desirable if you want to be able to trace your communications and prove that they occurred. Repudiation Denial of message submission or delivery.
How does Traceroute map the route that a packet travels from point A to point B?
A. It uses a TCP Timestamp packet that will elicit a time exceed in transit message.
B. It uses a protocol that will be rejected at the gateways on its way to its destination.
C. It manipulates the value of time to live (TTL) parameter packet to elicit a time exceeded in transit message.
D. It manipulated flags within packets to force gateways into generating error messages.
400-051 dumps Correct Answer: C
Traceroute works by increasing the “time-to-live” value of each successive batch of packets sent. The first three packets have a time-to-live (TTL) value of one (implying that they make a single hop). The next three packets have a TTL value of 2, and so on. When a packet passes through a host, normally the host decrements the TTL value by one, and forwards the packet to the next host. When a packet with a TTL of one reaches a host, the host discards the packet and sends an ICMP time exceeded (type 11) packet to the sender. The traceroute utility uses these returning packets to produce a list of hosts that the packets have traversed en route to the destination.
Snort has been used to capture packets on the network. On studying the packets, the penetration tester finds it to be abnormal. If you were the penetration tester, why would you find this abnormal? (Note: The student is being tested on concept learnt during passive OS fingerprinting, basic TCP/IP connection concepts and the ability to read packet signatures
from a sniff dumo.) 05/20-17:06:45.061034 188.8.131.52:31337 -> 172.16.1.101:1 TCP TTL:44 TOS:0x10 ID:242 ***FRP** Seq: 0XA1D95 Ack: 0x53 Win: 0x40005/20-17:06:58.685879 184.108.40.206:31337 -> 172.16.1.101:1024 TCP TTL:44 TOS:0x10 ID:242 ***FRP** Seg: 0XA1D95 Ack: 0x53 Win: 0x400 What is odd about this attack? (Choose the most appropriate statement)
A. This is not a spoofed packet as the IP stack has increasing numbers for the three flags.
B. This is back orifice activity as the scan comes from port 31337.
C. The attacker wants to avoid creating a sub-carrier connection that is not normally valid.
D. There packets were created by a tool; they were not created by a standard IP stack.
Correct Answer: B
Port 31337 is normally used by Back Orifice. Note that 31337 is hackers spelling of `elite’, meaning `elite hackers’.
Your company trainee Sandra asks you which are the four existing Regional Internet Registry (RIR’s)?
A. APNIC, PICNIC, ARIN, LACNIC
B. RIPE NCC, LACNIC, ARIN, APNIC
C. RIPE NCC, NANIC, ARIN, APNIC
D. RIPE NCC, ARIN, APNIC, LATNIC
400-051 pdf Correct Answer: B
All other answers include non existing organizations (PICNIC, NANIC, LATNIC). See
A very useful resource for passively gathering information about a target company is:
A. Host scanning
B. Whois search
D. Ping sweep
Correct Answer: B
A, C & D are “Active” scans, the question says: “Passively”
You receive an email with the following message: Hello Steve, We are having technical difficulty in restoring user database record after the recent blackout. Your account data is corrupted. Please logon to the SuperEmailServices.com and change your password. If you do not reset your password within 7 days, your account will be permanently disabled locking you out from our e-mail services. From this e-mail you suspect that this message was sent by some hacker since you have been using their e-mail services for the last 2 years and they have never sent out an e-mail such as this. You also observe the URL in the message and confirm your suspicion about 0xde.0xad.0xbde.0xef which looks like hexadecimal numbers. You immediately enter the following at Windows 2000 command prompt: Ping 0xde.0xad.0xbe.0xef You get a response with a valid IP address. What is the obstructed IP address in the e-mail URL?
400-051 vce Correct Answer: A
0x stands for hexadecimal and DE=222, AD=173, BE=190 and EF=239
Which of the following tools are used for footprinting?(Choose four.
A. Sam Spade
Correct Answer: ABCD
All of the tools listed are used for footprinting except Cheops.
According to the CEH methodology, what is the next step to be performed after footprinting?
C. System Hacking
D. Social Engineering
E. Expanding Influence
400-051 exam Correct Answer: B
Once footprinting has been completed, scanning should be attempted next. Scanning should take place on two distinct levels: network and host.
NSLookup is a good tool to use to gain additional information about a target network. What does the following command accomplish?
> server <ipaddress>
> set type =any
> ls -d <target.com>
A. Enables DNS spoofing
B. Loads bogus entries into the DNS table
C. Verifies zone security
D. Performs a zone transfer
E. Resets the DNS cache
Correct Answer: D
If DNS has not been properly secured, the command sequence displayed above will perform a zone transfer.
While footprinting a network, what port/service should you look for to attempt a zone transfer?
A. 53 UDP
B. 53 TCP
C. 25 UDP
D. 25 TCP
E. 161 UDP
F. 22 TCP
G. 60 TCP
400-051 dumps Correct Answer: B
IF TCP port 53 is detected, the opportunity to attempt a zone transfer is there.
Your lab partner is trying to find out more information about a competitors web site. The site has a .com extension. She has decided to use some online whois tools and look in one of the regional Internet registrys. Which one would you suggest she looks in first?
Correct Answer: B
Regional registries maintain records from the areas from which they govern. ARIN is responsible for domains served within North and South America and therefore, would be a good starting point for a .com domain.
Network Administrator Patricia is doing an audit of the network. Below are some of her findings concerning DNS. Which of these would be a cause for alarm? Select the best answer.
A. There are two external DNS Servers for Internet domains. Both are AD integrated.
B. All external DNS is done by an ISP.
C. Internal AD Integrated DNS servers are using private DNS names that are
E. Private IP addresses are used on the internal network and are registered with the internal AD integrated DNS server.
400-051 pdf Correct Answer: A
A. There are two external DNS Servers for Internet domains. Both are AD integrated. This is the correct answer. Having an AD integrated DNS external server is a serious cause for alarm. There is no need for this and it causes vulnerability on the network.
B. All external DNS is done by an ISP. This is not the correct answer. This would not be a cause for alarm. This would actually reduce the company’s network risk as it is offloaded onto the ISP. C. Internal AD Integrated DNS servers are using private DNS names that are unregistered. This is not the correct answer. This would not be a cause for alarm. This would actually reduce the company’s network risk.
D. Private IP addresses are used on the internal network and are registered with the internal AD integrated DNS server. This is not the correct answer. This would not be a cause for alarm. This would actually reduce the company’s network risk.
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Cisco 400-051 exam braindumps PDF, are basically the 400-051 dumps exam questions as well as the answers that are taken from Cisco CCIE Collaboration Written exam.”CCIE Collaboration”, also known as 400-051 exam, is a Cisco certification which covers all the knowledge points of the real Cisco exam. Pass4itsure Cisco 400-051 dumps exam questions answers are updated (615 Q&As) are verified by experts. The associated certifications of https://www.pass4itsure.com/400-051.html dumps is CCIE Collaboration.
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