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NEW QUESTION: 1
What are the three modes of Unicast Reverse Path Forwarding?
A. broadcast mode, loose mode, and VRF mode
B. strict mode, loose mode, and broadcast mode
C. strict mode, broadcast mode, and VRF mode
D. strict mode, loose mode, and VRF mode
Answer: D
Explanation:
Explanation

Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this document.
When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network.
When administrators use Unicast RPF in loose mode, the source address must appear in the routing table.
Administrators can change this behavior using the allow-default option, which allows the use of the default route in the source verification process. Additionally, a packet that contains a source address for which the return route points to the Null 0 interface will be dropped. An access list may also be specified that permits or denies certain source addresses in Unicast RPF loose mode.
Care must be taken to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain asymmetric routing paths.
Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html

NEW QUESTION: 2
Why is the concept of Continuous Integration and Testing important to the Agile conversation?
A. It gives organizations the ability to align business processes and functional testing with performance and security testing to ensure better quality.
B. Simply reducing the total number of sprints required to complete a software project will reduce delivery costs and increase quality.
C. It increases the total number of sprints required to complete a software project and will reduce delivery costs and increase quality.
D. Merely increasing the pace of development without addressing the full software development lifecycle will cause bottlenecks in other aspects of the lifecycle.
Answer: C

NEW QUESTION: 3
A project has a current cost performance index (CPI) of 1.25. To date, US$10,000 have been spent on performing the project work.
What is the earned value of the work completed to date?
A. US$S000
B. US$10,000
C. US$12,500
D. US$9500
Answer: C

NEW QUESTION: 4
下列选项中,哪些是基于 MAC 地址的 802.1x 验证的特点 ? （多选)
A. 端口下的所有接入用户需要单独验证
B. 当端口下的第一个用户下线后,其他用户也会被拒绝使用网络
C. 当某个用户下线时,只有该用户无法使用网络
D. 只要端口下的第一个用户验证成功后,其他接入用户无须验证就可使用网络资源
Answer: A,C