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NEW QUESTION: 1
This Apex class allows developers to collect and display errors when building custom controllers or extensions.
A. Exception Class
B. Messaging Class
C. Message Class
D. None of the above
E. Debug Class
F. Validation Class
Answer: C

NEW QUESTION: 2
Oracle Cloud Infrastructureでインスタンスを起動するために必要なパラメータはどれですか？ （5つ選択してください。）
A. 可用性ドメイン
B. 仮想クラウドネットワーク
C. イメージオペレーティングシステム
D. ホスト名
E. サブネット
F. プライベートIPアドレス
G. インスタンス形状
Answer: A,B,C,E,G
Explanation:
Explanation
References: https://docs.cloud.oracle.com/iaas/Content/Compute/Concepts/computeoverview.htm

NEW QUESTION: 3
DRAG DROP
You need to modify the ExecuteCommandProcedure() method to meet the technical requirements. Which code segment should you use?

Answer:
Explanation:

NEW QUESTION: 4
Which three conditions can cause excessive unicast flooding? (Choose three.)
A. Asymmetric routing
B. MAC forwarding table overflow
C. The use of HSRP
D. Repeated TCNs
E. The use of Unicast Reverse Path Forwarding
F. Frames sent to FFFF.FFFF.FFFF
Answer: A,B,D
Explanation:
Causes of Flooding
The very cause of flooding is that destination MAC address of the packet is not in the L2 forwarding table of the
switch. In this case the packet will be flooded out of all forwarding ports in its VLAN (except the port it was received
on). Below case studies display most common reasons for destination MAC address not being known to the switch.
Cause 1: Asymmetric Routing
Large amounts of flooded traffic might saturate low-bandwidth links causing network performance issues or complete
connectivity outage to devices connected across such low-bandwidth links.
Cause 2: Spanning-Tree Protocol Topology Changes
Another common issue caused by flooding is Spanning-Tree Protocol (STP) Topology Change Notification (TCN). TCN is
designed to correct forwarding tables after the forwarding topology has changed. This is necessary to avoid a
connectivity outage, as after a topology change some destinations previously accessible via particular ports might
become accessible via different ports. TCN operates by shortening the forwarding table aging time, such that if the
address is not relearned, it will age out and flooding will occur.
TCNs are triggered by a port that is transitioning to or from the forwarding state. After the TCN, even if the particular
destination MAC address has aged out, flooding should not happen for long in most cases since the address will be
relearned. The issue might arise when TCNs are occurring repeatedly with short intervals. The switches will constantly
be fast-aging their forwarding tables so flooding will be nearly constant.
Normally, a TCN is rare in a well-configured network. When the port on a switch goes up or down, there is eventually
a TCN once the STP state of the port is changing to or from forwarding. When the port is flapping, repetitive TCNs and
flooding occurs.
Cause 3: Forwarding Table Overflow
Another possible cause of flooding can be overflow of the switch forwarding table. In this case, new addresses cannot
be learned and packets destined to such addresses are flooded until some space becomes available in the forwarding
table. New addresses will then be learned. This is possible but rare, since most modern switches have large enough
forwarding tables to accommodate MAC addresses for most designs.
Forwarding table exhaustion can also be caused by an attack on the network where one host starts generating frames
each sourced with different MAC address. This will tie up all the forwarding table resources. Once the forwarding
tables become saturated, other traffic will be flooded because new learning cannot occur. This kind of attack can be
detected by examining the switch forwarding table. Most of the MAC addresses will point to the same port or group
of ports. Such attacks can be prevented by limiting the number of MAC addresses learned on untrusted ports by using
the port security feature.
Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23563-
143.html#causes