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NEW QUESTION: 1
Which three statements about remotely triggered black hole filtering are true? (Choose three.)
A. It uses BGP or OSPF to trigger a network-wide remotely controlled response to attacks.
B. Three key components of an RTBH filtering solution are: uRPF, iBGP and a null0 interface.
C. It requires loose uRPF for destination based filtering.
D. ICMP unreachable messages must not be disabled on all edge PE routers peered with the trigger router.
E. It supports both source-based and destination-based filtering.
F. It can be used to mitigate DDoS and worm attacks.
Answer: D,E,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(R) 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: 2
バックアップのテストに使用するRecovery Serviceボルトがあります。テストバックアップには、2つの保護された仮想マシンが含まれています。
Recovery Servicesコンテナーを削除する必要があります。
最初に何をすべきですか？
A. 各仮想マシンの惨事復旧プロパティを変更します。
B. Recovery Serviceコンテナーから、バックアップデータを削除します。
C. 各仮想マシンのロックを変更します。
D. Recovery Serviceコンテナーから、各バックアップ項目のバックアップを停止します。
Answer: D
Explanation:
You can't delete a Recovery Services vault if it is registered to a server and holds backup data. If you try to delete a vault, but can't, the vault is still configured to receive backup data.
Remove vault dependencies and delete vault
In the vault dashboard menu, scroll down to the Protected Items section, and click Backup Items.
In this menu, you can stop and delete Azure File Servers, SQL Servers in Azure VM, and Azure virtual machines.
References: https://docs.microsoft.com/en-us/azure/backup/backup-azure-delete-vault You can't delete a Recovery Services vault if it is registered to a server and holds backup data. If you try to delete a vault, but can't, the vault is still configured to receive backup data.
Remove vault dependencies and delete vault
In the vault dashboard menu, scroll down to the Protected Items section, and click Backup Items.
In this menu, you can stop and delete Azure File Servers, SQL Servers in Azure VM, and Azure virtual machines.
NEW QUESTION: 3
A company is using Amazon RDS for MySQL. The company disaster recovery requirements state that a near real time replica of the database must be maintained on premises.
The company wants the data to be encrypted in transit/
Which solution meets these requirements?
A. Use the Amazon RDS Multi-Az Feature. Choose on premises as the failover availability zone over an IPsec vpn on top of an AWS Direct Connect Connection
B. Use MySQL replication to replicate from AWS to on premises over an IPsec VPN on top of an AWS Direct Connect Connection.
C. Use AWS Database Migration Service (AWS DMS) and AWS Direct Connect to migrate the data from AWS to on premises.
D. Use AWS Data Pipeline to replicate from AWS to on premises over an IPsec VPN on top of an AWS Direct Connect Connection.
Answer: A
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