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NEW QUESTION: 1
Which of the following will help prevent smurf attacks?
A. Disabling unused services on the gateway firewall
B. Disabling directed broadcast on border routers
C. Allowing necessary UDP packets in and out of the network
D. Flash the BIOS with the latest firmware
Answer: B
Explanation:
Explanation/Reference:
Explanation:
A smurf attack involves sending PING requests to a broadcast address. Therefore, we can prevent smurf attacks by blocking broadcast packets on our external routers.
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.
NEW QUESTION: 2
Sara, the security administrator, must configure the corporate firewall to allow all public IP addresses on the internal interface of the firewall to be translated to one public IP address on the external interface of the same firewall. Which of the following should Sara configure?
A. PAT
B. NAP
C. DNAT
D. NAC
Answer: A
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.
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.
Incorrect Answers:
B. NAP is a Microsoft technology for controlling network access of a computer host based on system health of the host.
C. Destination network address translation (DNAT) is a technique for transparently changing the destination IP address of an end route packet and performing the inverse function for any replies. Any router situated between two endpoints can perform this transformation of the packet. DNAT is commonly used to publish a service located in a private network on a publicly accessible IP address. This use of DNAT is also called port forwarding. DNAT does not allow for many internal devices to share one public IP address.
D. NAC is an approach to computer network security that attempts to unify endpoint security technology (such as antivirus, host intrusion prevention, and vulnerability assessment), user or system authentication and network security enforcement.
References:
http://searchnetworking.techtarget.com/definition/Port-Address-Translation-PAT
http://en.wikipedia.org/wiki/Network_Access_Protection
http://en.wikipedia.org/wiki/Network_address_translation#DNAT
http://en.wikipedia.org/wiki/Network_Access_Control
NEW QUESTION: 3
다음 중 최고 감사 책임자가 사용할 수 있는 허용 가능한 자원은 무엇입니까?
인력 계획을 개발?
1. 공동 구매 계약.
2. 조직의 다른 영역의 직원.
3. 조직의 외부 감사.
4. 조직의 감사위원회 위원.
A. 2와 3 만
B. 1과 2 만
C. 1,2 및 4 만
D. 1 만
Answer: B
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