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NEW QUESTION: 1



A. Option D
B. Option B
C. Option A
D. Option C
Answer: C

NEW QUESTION: 2
Which three statements about remotely triggered black hole filtering are true? (Choose three.)
A. It can be used to mitigate DDoS and worm attacks.
B. It uses BGP or OSPF to trigger a network-wide remotely controlled response to attacks.
C. Three key components of an RTBH filtering solution are: uRPF, iBGP and a null0 interface.
D. It supports both source-based and destination-based filtering.
E. It requires loose uRPF for destination based filtering.
F. ICMP unreachable messages must not be disabled on all edge PE routers peered with the trigger router.
Answer: A,D,F
Explanation:
Black holes, from a network security perspective, are placed in the network where traffic is forwarded and dropped. Once an attack has been detected, black holing can be used to drop all attack traffic at the edge of an Internet service provide (ISP) network, based on either destination or source IP addresses.
RTBH filtering provides a method for quickly dropping undesirable traffic at the edge of the network, based on either source addresses or destination addresses by forwarding it to a null0 interface. Null0 is a pseudointerface that is always up and can never forward or receive traffic. Forwarding packets to null0 is a common way to filter packets to a specific destination.
Typically, when an IP datagram is dropped, an Internet Control Message Protocol (ICMP) unreachable message is sent back to the source giving the reason why the packet could not be delivered to its final destination. In most cases, when traffic is deliberately dropped by being forwarded to a null interface, you do not want to overburden the router by making it send this unreachable message to the source address. Also, these messages would create additional traffic on the network and inform the source that the packets are being dropped. So, it is recommended that when a Null0 interface is created at the edges, the ICMP unreachable message is disabled for this interface.
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.
The edge routers essentially drop suspicious traffic by forwarding it to a Null0 interface. Null0 is an invalid interface in Cisco@ Express Forwarding tables, so all traffic forwarded to a null interface will be dropped by Cisco Express Forwarding and does not require process switching. Hence, using Null0 as a way to filter traffic adds minimal overhead to the edge routers. A static route is configured at the edge, and the next hop is set to Null0.

NEW QUESTION: 3
ある会社は、ソフトウェアテストに使用されるいくつかのラボ環境の移行を計画しています。各種のカスタムツールを使用して、各ラボのテスト実行を管理します。ラボでは、ソフトウェアテストの実行に不変のインフラストラクチャを使用し、結果は可用性の高いSQLデータベースクラスターに保存されます。カスタムツールを完全に書き直すことは移行プロジェクトの範囲外ですが、会社は移行中にワークロードを最適化したいと考えています。
どのアプリケーション移行戦略がこの要件を満たしていますか？
A. プラットフォーム変更
B. 引退
C. 再ホスト
D. リファクタリング/再設計
Answer: A