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NEW QUESTION: 1
A network analyst received a number of reports that impersonation was taking place on the network. Session tokens w ere deployed to mitigate this issue and defend against which of the following attacks?
A. DDoS
B. Ping of Death
C. Replay
D. Smurf
Answer: C
Explanation:
A replay attack (also known as playback attack) is a form of network attack in which a valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and retransmits it, possibly as part of a masquerade attack by IP packet substitution (such as stream cipher attack).
For example: Suppose Alice wants to prove her identity to Bob. Bob requests her password as proof of identity, which
Alice dutifully provides (possibly after some transformation like a hash function); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (posing as Alice) connects to
Bob; when asked for a proof of identity, Eve sends Alice's password (or hash) read from the last session, which Bob accepts thus granting access to Eve.
Countermeasures: A way to avoid replay attacks is by using session tokens: Bob sends a one-time token to Alice, w hich Alice uses to transform the password and send the result to Bob (e.g. computing a hash function of the session token appended to the password). On his side Bob performs the same computation; if and only if both values match, the login is successful. Now suppose Eve has captured this value and tries to use it on another session; Bob sends a different session token, and when Eve replies with the captured value it will be different from Bob's computation.
Session tokens should be chosen by a (pseudo-) random process. Otherwise Eve may be able to pose as Bob, presenting some predicted future token, and convince Alice to use that token in her transformation. Eve can then replay her reply at a later time (when the previously predicted token is actually presented by Bob), and Bob will accept the authentication.
One-time passwords are similar to session tokens in that the password expires after it has been used or after a very short amount of time. They can be used to authenticate individual transactions in addition to sessions. The technique has been widely implemented in personal online banking systems.
Bob can also send nonces but should then include a message authentication code (MAC), which Alice should check.
Timestamping is another way of preventing a replay attack. Synchronization should be achieved using a secure protocol. For example Bob periodically broadcasts the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message, which is also authenticated. Bob only accepts messages for which the timestamp is within a reasonable tolerance. The advantage of this scheme is that Bob does not need to generate (pseudo-) random numbers, with the trade-off being that replay attacks, if they are performed quickly enough i.e. within that 'reasonable' limit, could succeed.
Incorrect Answers:
B. A Distributed Denial of Service (DDoS) attack is an attack from several different computers targeting a single computer.
One common method of attack involves saturating the target machine with external communications requests, so much so that it cannot respond to legitimate traffic, or responds so slowly as to be rendered essentially unavailable.
Such attacks usually lead to a server overload.
A distributed denial-of-service (DDoS) attack occurs when multiple systems flood the bandwidth or resources of a targeted system, usually one or more web servers. Such an attack is often the result of multiple compromised systems
(for example a botnet) flooding the targeted system with traffic. When a server is overloaded with connections, new connections can no longer be accepted. Session tokens are not used to defend against this type of attack.
C. A smurf attack is a type of network security breach in which a network connected to the Internet is swamped with replies to ICMP echo (PING) requests. A smurf attacker sends PING requests to an Internet broadcast address. These are special addresses that broadcast all received messages to the hosts connected to the subnet. Each broadcast address can support up to 255 hosts, so a single PING request can be multiplied 255 times. The return address of the request itself is spoofed to be the address of the attacker's victim. All the hosts receiving the PING request reply to this victim's address instead of the real sender's address. A single attacker sending hundreds or thousands of these
PING messages per second can fill the victim's T-1 (or even T-3) line with ping replies, bring the entire Internet service to its knees.
Smurfing falls under the general category of Denial of Service attacks -- security attacks that don't try to steal information, but instead attempt to disable a computer or network. Session tokens are not used to defend against this type of attack.
D. A ping of death is a type of attack on a computer that involves sending a malformed or otherwise malicious ping to a computer.
A correctly formed ping message is typically 56 bytes in size, or 84 bytes when the Internet Protocol [IP] header is considered. Historically, many computer systems could not properly handle a ping packet larger than the maximum
IPv4 packet size of 65535bytes. Larger packets could crash the target computer.
In early implementations of TCP/IP, this bug was easy to exploit. This exploit affected a wide variety of systems, including Unix, Linux, Mac, Windows, printers, and routers.
Generally, sending a 65,536-byte ping packet violates the Internet Protocol as documented in RFC 791, but a packet of such a size can be sent if it is fragmented; when the target computer reassembles the packet, a buffer overflow can occur, which often causes a system crash.
Later a different kind of ping attack became widespread-ping flooding simply floods the victim with so much ping traffic that normal traffic fails to reach the system, a basic denial-of-service attack.
Session tokens are not used to defend against this type of attack.
References:
http://en.wikipedia.org/wiki/Replay_attack
http://www.webopedia.com/TERM/S/smurf.html
http://en.wikipedia.org/wiki/Ping_of_death
NEW QUESTION: 2
SIMULATION
A corporation wants to add security to its network. The requirements are:
* Host C should be able to use a web browser (HTTP) to access the Finance Web Server.
* Other types of access from host C to the Finance Web Server should be blocked.
* All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.
* All hosts in the Core and on local LAN should be able to access the Public Web Server.
You have been tasked to create and apply a numbered access list to a single outbound interface. This access list can contain no more than three statements that meet these requirements.
Access to the router CLI can be gained by clicking on the appropriate host.
* All passwords have been temporarily set to "cisco".
* The Core connection uses an IP address of 198.18.209.65.
* The computers in the Hosts LAN have been assigned addresses of 192.168.78.1 - 192.168.78.254.
* host A 192.168.78.1
* host B 192.168.78.2
* host C 192.168.78.3
* host D 192.168.78.4
* The Finance Web Server has been assigned an address of 172.22.146.17.
* The Public Web Server in the Server LAN has been assigned an address of 172.22.146.18.
A. Please see below part for details answer steps:
We should create an access-list and apply it to the interface that is connected to the Server LAN because it can filter out traffic from both S2 and Core networks. To see which interface this is, use the "show ip int brief" command:
From this, we know that the servers are located on the fa0/1 interface, so we will place our numbered access list here in the outbound direction.
Corp1#configure terminal
Our access-list needs to allow host C - 192.168125.3 to the Finance Web Server 172.22.109.17 via HTTP (port 80), so our first line is this:
Corp1(config)#access-list 100 permit tcp host 192.168.125.3 host 172.22.109.17 eq 80 Then, our next two instructions are these:
Other types of access from host C to the Finance Web Server should be blocked.
All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.
This can be accomplished with one command (which we need to do as our ACL needs to be no more than 3 lines long), blocking all other access to the finance web server:
Corp1(config)#access-list 100 deny ip any host 172.22.109.17
Our last instruction is to allow all hosts in the Core and on the local LAN access to the Public Web Server (172.22.109.18) Corp1(config)#access-list 100 permit ip host 172.22.109.18 any Finally, apply this access-list to Fa0/1 interface (outbound direction) Corp1(config)#interface fa0/1 Corp1(config-if)#ip access-group 100 out Notice: We have to apply the access-list to Fa0/1 interface (not Fa0/0 interface) so that the access-list can filter traffic coming from both the LAN and the Core networks.
To verify, just click on host C to open its web browser. In the address box type http://172.22.109.17 to check if you are allowed to access Finance Web Server or not. If your configuration is correct then you can access it.
Click on other hosts (A, B and D) and check to make sure you can't access Finance Web Server from these hosts. Then, repeat to make sure they can reach the public server at 172.22.109.18. Finally, save the configuration Corp1(config-if)#end Corp1#copy running-config startup-config
B. Please see below part for details answer steps:
We should create an access-list and apply it to the interface that is connected to the Server LAN because it can filter out traffic from both S2 and Core networks. To see which interface this is, use the "show ip int brief" command:
From this, we know that the servers are located on the fa0/1 interface, so we will place our numbered access list here in the outbound direction.
Corp1#configure terminal
Our access-list needs to allow host C - 192.168125.3 to the Finance Web Server 172.22.108.17 via HTTP (port 80), so our first line is this:
Corp1(config)#access-list 100 permit tcp host 192.166.125.3 host 172.22.108.17 eq 80 Then, our next two instructions are these:
Other types of access from host C to the Finance Web Server should be blocked.
All access from hosts in the Core or local LAN to the Finance Web Server should be blocked.
This can be accomplished with one command (which we need to do as our ACL needs to be no more than 3 lines long), blocking all other access to the finance web server:
Corp1(config)#access-list 100 deny ip any host 172.44.109.17
Our last instruction is to allow all hosts in the Core and on the local LAN access to the Public Web Server (172.22.109.18) Corp1(config)#access-list 100 permit ip host 172.22.108.18 any Finally, apply this access-list to Fa0/1 interface (outbound direction) Corp1(config)#interface fa0/1 Corp1(config-if)#ip access-group 100 out Notice: We have to apply the access-list to Fa0/1 interface (not Fa0/0 interface) so that the access-list can filter traffic coming from both the LAN and the Core networks.
To verify, just click on host C to open its web browser. In the address box type http://172.22.108.17 to check if you are allowed to access Finance Web Server or not. If your configuration is correct then you can access it.
Click on other hosts (A, B and D) and check to make sure you can't access Finance Web Server from these hosts. Then, repeat to make sure they can reach the public server at 172.22.109.18. Finally, save the configuration Corp1(config-if)#end Corp1#copy running-config startup-config
Answer: A
NEW QUESTION: 3
An agile project is in its eighth iteration out of 16 After the last iteration review, the team members receive feedback from the security department about regulations with which the project must comply Which two actions should the project manager take? (Choose two)
A. Ask the security department for details about regulations
B. Ask the product owner to include the requirements in the product backlog
C. Ask the team members to analyze the impact of including this regulation
D. Ask the stakeholders about the priority of this regulation
E. Ask the team members to include the requirements in the next iteration
Answer: A,B
NEW QUESTION: 4
フェールオーバーインターフェイスを介した通信について正しい説明はどれですか。
A. フェイルオーバーとステートフルフェールオーバーインターフェイスを介して送信されるすべての情報は、デフォルトで暗号化されています。
B. フェールオーバーインターフェイスを介して送信されるすべての情報がクリアテキストとして送信されますが、ステートフルフェールオーバーリンクは、デフォルトで暗号化されています。
C. 彼らは、フェールオーバーとステートフルフェールオーバーインターフェイスを介して送信される際に、ユーザー名、パスワード、および事前共有キーは、デフォルトで暗号化されますが、他の情報はクリアテキストとして送信されます。
D. フェイルオーバーとステートフルフェールオーバーインターフェイスを介して送信されるすべての情報は、デフォルトでクリアテキストとして送信されます。
Answer: D
Explanation:
All information sent over the failover and Stateful Failover links is sent in clear text unless you secure the communication with a failover key. If the security appliance is used to terminate VPN tunnels, this information includes any usernames, passwords and preshared keys used for establishing the tunnels. Transmitting this sensitive data in clear text could pose a significant security risk. We recommend securing the failover communication with a failover key if you are using the security appliance to terminate VPN tunnels.
Source: http://www.cisco.com/c/en/us/td/docs/security/asa/asa80/configuration/guide/conf_gd/failover.html