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Free 312-50 Exam Braindumps (page: 5)

Page 5 of 191
PDF with 765 Questions

A Company security System Administrator is reviewing the network system log files. He notes the following:
Network log files are at 5 MB at 12:00 noon. At 14:00 hours, the log files at 3 MB.
What should he assume has happened and what should he do about the situation?

  1. He should contact the attacker’s ISP as soon as possible and have the connection disconnected.
  2. He should log the event as suspicious activity, continue to investigate, and take further steps according to site security policy.
  3. He should log the file size, and archive the information, because the router crashed.
  4. He should run a file system check, because the Syslog server has a self correcting file system problem.
  5. He should disconnect from the Internet discontinue any further unauthorized use, because an attack has taken place.

Answer(s): B

Explanation:

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?

  1. Message repudiation means a user can validate which mail server or servers a message was passed through.
  2. Message repudiation means a user can claim damages for a mail message that damaged their reputation.
  3. Message repudiation means a recipient can be sure that a message was sent from a particular person.
  4. Message repudiation means a recipient can be sure that a message was sent from a certain host.
  5. Message repudiation means a sender can claim they did not actually send a particular message.

Answer(s): E

Explanation:

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?

  1. It uses a TCP Timestamp packet that will elicit a time exceed in transit message.
  2. It uses a protocol that will be rejected at the gateways on its way to its destination.
  3. It manipulates the value of time to live (TTL) parameter packet to elicit a time exceeded in transit message.
  4. It manipulated flags within packets to force gateways into generating error messages.

Answer(s): C

Explanation:

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 192.160.13.4:31337 -> 172.16.1.101:1
TCP TTL:44 TOS:0x10 ID:242
***FRP** Seq: 0XA1D95 Ack: 0x53 Win: 0x400
.
.
.
05/20-17:06:58.685879 192.160.13.4:31337 -> 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)

  1. This is not a spoofed packet as the IP stack has increasing numbers for the three flags.
  2. This is back orifice activity as the scan comes from port 31337.
  3. The attacker wants to avoid creating a sub-carrier connection that is not normally valid.
  4. There packets were created by a tool; they were not created by a standard IP stack.

Answer(s): B

Explanation:

Port 31337 is normally used by Back Orifice. Note that 31337 is hackers spelling of ‘elite’, meaning ‘elite hackers’.



Page 5 of 191



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