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NEW QUESTION: 1
Which of the following is an extension to Network Address Translation that permits multiple devices providing services on a local area network (LAN) to be mapped to a single public
IP address?
A. IP subnetting
B. Port address translation
C. IP Distribution
D. IP Spoofing
Answer: B
Explanation:
Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to conserve IP addresses or to publish multiple hosts with service to the internet while having only one single IP assigned on the external side of your gateway.
Most home networks use PAT. In such a scenario, the Internet Service Provider (ISP) assigns a single IP address to the home network's router. When Computer X logs on the
Internet, the router assigns the client a port number, which is appended to the internal IP address. This, in effect, gives Computer X a unique address. If Computer Z logs on the
Internet at the same time, the router assigns it the same local IP address with a different port number. Although both computers are sharing the same public IP address and accessing the Internet at the same time, the router knows exactly which computer to send specific packets to because each computer has a unique internal address.
Port Address Translation is also called porting, port overloading, port-level multiplexed NAT and single address NAT.
Shon Harris has the following example in her book:
The company owns and uses only one public IP address for all systems that need to communicate outside the internal network. How in the world could all computers use the exact same IP address? Good question. Here's an example: The NAT device has an IP address of 127.50.41.3. When computer A needs to communicate with a system on the
Internet, the NAT device documents this computer's private address and source port number (10.10.44.3; port 43,887). The NAT device changes the IP address in the computer's packet header to 127.50.41.3, with the source port 40,000. When computer B also needs to communicate with a system on the Internet, the NAT device documents the private address and source port number (10.10.44.15; port 23,398) and changes the header information to 127.50.41.3 with source port 40,001. So when a system responds to computer A, the packet first goes to the NAT device, which looks up the port number
40,000 and sees that it maps to computer A's real information. So the NAT device changes the header information to address 10.10.44.3 and port 43,887 and sends it to computer A for processing. A company can save a lot more money by using PAT, because the company needs to buy only a few public IP addresses, which are used by all systems in the network.
As mentioned on Wikipedia:
NAT is also known as Port Address Translation: is a feature of a network device that translate TCP or UDP communications made between host on a private network and host on a public network. I allows a single public IP address to be used by many host on private network which is usually a local area network LAN
NAT effectively hides all TCP/IP-level information about internal hosts from the Internet.
The following were all incorrect answer:
IP Spoofing - In computer networking, the term IP address spoofing or IP spoofing refers to the creation of Internet Protocol (IP) packets with a forged source IP address, called spoofing, with the purpose of concealing the identity of the sender or impersonating another computing system.
Subnetting - Subnetting is a network design strategy that segregates a larger network into smaller components. While connected through the larger network, each subnetwork or subnet functions with a unique IP address. All systems that are assigned to a particular subnet will share values that are common for both the subnet and for the network as a whole.
A different approach to network construction can be thought of as subnetting in reverse.
Known as CIDR, or Classless Inter-Domain Routing, this approach also creates a series of subnetworks. Rather than dividing an existing network into small components, CIDR takes smaller components and connects them into a larger network. This can often be the case when a business is acquired by a larger corporation. Instead of doing away with the network developed and used by the newly acquired business, the corporation chooses to continue operating that network as a subsidiary or an added component of the corporation's network. In effect, the system of the purchased entity becomes a subnet of the parent company's network.
IP Distribution - This is a generic term which could mean distribution of content over an IP network or distribution of IP addresses within a Company. Sometimes people will refer to this as Internet Protocol address management (IPAM) is a means of planning, tracking, and managing the Internet Protocol address space used in a network. Most commonly, tools such as DNS and DHCP are used in conjunction as integral functions of the IP address management function, and true IPAM glues these point services together so that each is aware of changes in the other (for instance DNS knowing of the IP address taken by a client via DHCP, and updating itself accordingly). Additional functionality, such as controlling reservations in DHCP as well as other data aggregation and reporting capability, is also common. IPAM tools are increasingly important as new IPv6 networks are deployed with larger address pools, different subnetting techniques, and more complex 128-bit hexadecimal numbers which are not as easily human-readable as IPv4 addresses.
Reference(s) used for this question:
STREBE, Matthew and PERKINS, Charles, Firewalls 24seven, Sybex 2000, Chapter 1:
Understanding Firewalls.
Schneiter, Andrew (2013-04-15). Official (ISC)2 Guide to the CISSP CBK, Third Edition :
Telecommunications and Network Security, Page 350.
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition (Kindle Locations
12765-12774). Telecommunications and Network Security, Page 604-606
http://searchnetworking.techtarget.com/definition/Port-Address-Translation-PAT
http://en.wikipedia.org/wiki/IP_address_spoofing
http://www.wisegeek.com/what-is-subnetting.htm
http://en.wikipedia.org/wiki/IP_address_management
NEW QUESTION: 2
You are the network security engineer for the Secure-X network. The company has recently detected Increase of traffic to malware Infected destinations. The Chief Security Officer deduced that some PCs in the internal networks are infected with malware and communicate with malware infected destinations.
The CSO has tasked you with enable Botnet traffic filter on the Cisco ASA to detect and deny further connection attempts from infected PCs to malware destinations. You are also required to test your configurations by initiating connections through the Cisco ASA and then display and observe the Real-Time Log Viewer in ASDM.
To successfully complete this activity, you must perform the following tasks:
* Download the dynamic database and enable use of it.
* Enable the ASA to download of the dynamic database
* Enable the ASA to download of the dynamic database.
* Enable DNS snooping for existing DNS inspection service policy rules..
* Enable Botnet Traffic Filter classification on the outside interface for All Traffic.
* Configure the Botnet Traffic Filter to drop blacklisted traffic on the outside interface. Use the default Threat Level settings NOTE: The database files are stored in running memory; they are not stored in flash memory.
NOTE: DNS is enabled on the inside interface and set to the HQ-SRV (10.10.3.20).
NOTE: Not all ASDM screens are active for this exercise.
* Verify that the ASA indeed drops traffic to blacklisted destinations by doing the following:
* From
the Employee PC, navigate to http://www.google.com to make sure that access to the Internet is working.
* From
the Employee PC, navigate to http://bot-sparta.no-ip.org. This destination is classified as malware destination by the Cisco SIO database.
* From
the Employee PC, navigate to http://superzarabotok-gid.ru/. This destination is classified as malware destination by the Cisco SIO database.
* From Admin PC, launch ASDM to display and observe the Real-Time Log Viewer.
You have completed this exercise when you have configured and successfully tested Botnet traffic filter on the Cisco ASA.
Answer:
Explanation:
See the explanation for detailed answer to this sim question.
Explanation
First, click on both boxes on the Botnet Database as shown below and hit apply:
Shot 2015-06-17 at 5.00.31 PM.png
Click Yes to send the commands when prompted.
Then, click on the box on the DNS Snooping page as shown below and hit apply:
Shot 2015-06-17 at 5.02.54 PM.png
Click Yes to send the commands when prompted.
Then, click on the box on the Traffic Settings tab as shown:
Shot 2015-06-17 at 5.06.30 PM.png
At which point this pop-up box will appear when you click on the Add button:
Shot 2015-06-17 at 5.07.43 PM.png
Click OK. Then Apply. Then Send when prompted.
Then verify that all is working according to the instructions given in the question.
NEW QUESTION: 3
DRAG DROP
Answer:
Explanation:
Explanation:
Certificates are used to secure communications between federation servers, Web Application Proxies, federation server proxies, the cloud service, and web clients.
A Secure Sockets Layer (SSL) certificate is used to secure communications between federation servers, clients, Web Application Proxy, and federation server proxy computers.
A Token-signing certificate is a standard X.509 certificate that is used to securely sign all tokens that the federation server issues and that the cloud service will accept and validate.
References:
https://technet.microsoft.com/en-us/library/dn151311.aspx
http://blogs.technet.com/b/adfs/archive/2007/07/23/adfs-certificates-ssl-token-signing-and- client-authentication-certs.aspx
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