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NEW QUESTION: 1
You are working on a PDF document. You need to add tags to your PDF document in order to make it accessible. What will you do to accomplish the task?
A. Choose Page Display > Accessibility > Add Tags to Document.
B. Choose Tools > Accessibility > Add Tags to PDF Document.
C. Choose Tools > Accessibility > Add Tags to Document.
D. Choose Show/Hide > Accessibility > Add Tags to Document.
Answer: C
Explanation:
The best way to make PDFs accessible is to create a tagged document directly from an authoring application. However, if a PDF was created without tags, you can use Add Tags to Document for adding tags. Take the following steps to add tags to an existing PDF.
1.Open the PDF.
2.Choose Tools > Accessibility > Add Tags to Document.
Answer options D, B, and A are incorrect. These options will not accomplish the task.
NEW QUESTION: 2
A. Option C
B. Option E
C. Option A
D. Option B
E. Option D
Answer: C,D
NEW QUESTION: 3
Which two options correctly describe Remote Triggered Black Hole Filtering (RFC 5635)? (Choose two.)
A. RTBH destination based filtering can drop traffic destined to a host based on triggered entries in the FIB.
B. When setting the BGP community attribute in a route-map for RTBH use the no-export community unless BGP confederations are used then use local-as to advertise to sub-as confederations
C. Strict uRPF must be used in conjunction with RTBH source based filtering
D. RTBH uses a discard route on the edge devices of the network and a route server to send triggered route updates
E. Loose uRPF must be used in conjunction with RTBH destination based filtering
F. RTBH source based filtering will drop traffic from a source destined to a host based on triggered entries in the RIB
Answer: A,D
Explanation:
Destination-Based Remotely Triggered Black Hole Filtering With a denial-of-service (DoS) attack, in addition to service degradation of the target, there is possible collateral damage such as bandwidth consumption, processor utilization, and potential service loss elsewhere in the network. One method to mitigate the damaging effects of such an attack is to black hole (drop) traffic destined to the IP address or addresses being attacked and to filter the infected host traffic at the edge of the network closest to the source of the attack. The challenge is to find a way to quickly drop the offending traffic at the network edge, document and track the black holed destination addresses, and promptly return these addresses to service once the threat disappears. Destination-based IP black hole filtering with remote triggering allows a network-wide destination-based black hole to be propagated by adding a simple static route to the triggering device (trigger). The trigger sends a routing update for the static route using iBGP to the other edge routers configured for black hole filtering. This routing update sets the next hop IP address to another preconfigured static route pointing to the null interface. This process is illustrated in Figure
1.Figure 1. Destination-Based Black Hole Filtering with Remote Triggering
The three steps in destination-based black hole filtering are summarized below. Step 1. The setup (preparation) A trigger is a special device that is installed at the NOC exclusively for the purpose of triggering a black hole. The trigger must have an iBGP peering relationship with all the edge routers, or, if using route reflectors, it must have an iBGP relationship with the route reflectors in every cluster. The trigger is also configured to redistribute static routes to its iBGP peers. It sends the static route by means of an iBGP routing update. The Provider Edges (PEs) must have a static route for an unused IP address space. For example, 192.0.2.1/32 is set to Null0. The IP address 192.0.2.1 is reserved for use in test networks and is not used as a deployed IP address.
The three steps in destination-based black hole filtering are summarized below. Step 1. The setup (preparation) A trigger is a special device that is installed at the NOC exclusively for the purpose of triggering a black hole. The trigger must have an iBGP peering relationship with all the edge routers, or, if using route reflectors, it must have an iBGP relationship with the route reflectors in every cluster. The trigger is also configured to redistribute static routes to its iBGP peers. It sends the static route by means of an iBGP routing update. The Provider Edges (PEs) must have a static route for an unused IP address space. For example, 192.0.2.1/32 is set to Null0. The IP address 192.0.2.1 is reserved for use in test networks and is not used as a deployed IP address. Step 2. The trigger An administrator adds a static route to the trigger, which redistributes the route by sending a BGP update to all its iBGP peers, setting the next hop to the target destination address under attack as 192.0.2.1 in the current example. The PEs receive their iBGP update and set their next hop to the target to the unused IP address space
192.0.2.1. The route to this address is set to null0 in the PE, using a static routing entry in the router configuration. The next hop entry in the forwarding information base (FIB) for the destination IP (target) is now updated to null0. All traffic to the target will now be forwarded to Null0 at the edge and dropped. Step 3. The withdrawal Once the trigger is in place, all traffic to the target destination is dropped at the PEs. When the threat no longer exists, the administrator must manually remove the static route from the trigger, which sends a BGP route withdrawal to its iBGP peers. This prompts the edge routers to remove the existing route for the target that is pointed to 192.0.2.1 and to install a new route based on the IGP routing information base (RIB).
Reference: http://www.cisco.com/web/about/security/intelligence/blackhole.pdf