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NEW QUESTION: 1
シリアルインターフェイスのフォールバック方法としてPAPを使用したCHAP認証を有効にするために、どのコマンドが使用されますか？
A. （config-if）#ppp authentication chap pap
B. （config-if）#authentication ppp chap pap
C. （config-if）#ppp authentication chap fallback ppp
D. （config-if）#authentication ppp chap fallback ppp
Answer: A
NEW QUESTION: 2
Research findings on productivity improvement show all of the following EXCEPT
A. productivity increases when the office environment is re-engineered.
B. productivity increases when employees are rewarded for extra output.
C. productivity goes up when it is measured.
D. productivity increases as it becomes the primary goal of management.
Answer: A
NEW QUESTION: 3
Scenario: An administrator is in the process of updating a database server on a virtual machine and would like to preserve its current state in case something goes wrong. The virtual machine is being used in a production environment and needs to remain online.
What can the administrator do to meet the requirements of the scenario?
A. Make a copy of the virtual machine in case the original needs to be deleted.
B. Preserve the virtual machine by exporting it to an external drive.
C. Enable high availablity to ensure the virtual machine remains online.
D. Perform an online backup by taking a snapshot of the virtual machine.
Answer: D
NEW QUESTION: 4
When implementing source-based remote-triggered black hole filtering, which two configurations are required on the edge routers that are not the signaling router? (Choose two.)
A. Redistribution into BGP of the static route that points to the IP address of the attacker
B. A route policy to set the redistributed static routes with the no-export BGP community
C. A static route pointing to the IP address of the attacker
D. uRPF on all external facing interfaces at the edge routers
E. A static route to a prefix that is not used in the network with a next hop set to the Null0 interface
Answer: D,E
Explanation:
Explanation/Reference:
Source-Based RTBH Filtering
With destination-based black holing, all traffic to a specific destination is dropped after the black hole has been activated, regardless of where it is coming from. Obviously, this could include legitimate traffic destined for the target. Source-based black holes provide the ability to drop traffic at the network edge based on a specific source address or range of source addresses.
If the source address (or range of addresses) of the attack can be identified (spoofed or not), it would be better to drop all traffic at the edge based on the source address, regardless of the destination address.
This would permit legitimate traffic from other sources to reach the target. Implementation of source-based black hole filtering depends on Unicast Reverse Path Forwarding (uRPF), most often loose mode uRPF.
Loose mode uRPF checks the packet and forwards it if there is a route entry for the source IP of the incoming packet in the router forwarding information base (FIB). If the router does not have an FIB entry for the source IP address, or if the entry points to a null interface, the Reverse Path Forwarding (RPF) check fails and the packet is dropped, as shown in Figure 2. Because uRPF validates a source IP address against its FIB entry, dropping traffic from specific source addresses is accomplished by configuring loose mode uRPF on the external interface and ensuring the RPF check fails by inserting a route to the source with a next hop of Null0. This can be done by using a trigger device to send IBGP updates. These updates set the next hop for the source IP to an unused IP address that has a static entry at the edge, setting it to null as shown in Figure 2.