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NEW QUESTION: 1
Given:
public class Main {
public static void main(String... ag) {
Vehicle v = new SportsCar();
System.out.println(v.goes());
Tank t = (Tank) v;
System.out.println(t);
}
}
class Vehicle {
public String goes() {
return "goes ";
};
}
class SportsCar extends Vehicle {
public String goes() {
return "fast ";
};
}
class Tank extends Vehicle {
public String goes() {
return "slow ";
};
}
What is the result?
A. Compilation fails
B. fast followed by an exception
C. fast fast
D. fast goes
E. fast slow
F. goes goes
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Line:Vehicle v = new Sportscar();
causes compilation failure:
error: cannot find symbol
Vehicle v = new Sportscar();
symbol: class Sportscar
location: class VehicleTest

NEW QUESTION: 2
Which three statements about firewall modes are correct? (Choose three.)
A. In transparent mode, the firewall is considered to be a Layer 2 device.
B. In transparent mode, the firewall is considered to be a Layer 3 device.
C. In routed mode, the firewall is considered to be a Layer 3 device.
D. A firewall in routed mode has one IP address.
E. A firewall in transparent mode has one IP address.
F. In routed mode, the firewall is considered to be a Layer 2 device.
Answer: A,C,E

NEW QUESTION: 3
Which statement is true about TCN propagation?
A. The TCN propagation is a two step process.
B. The root bridge must flood this information throughout the network.
C. The originator of the TCN immediately floods this information through the network.
D. A TCN is generated and sent to the root bridge.
Answer: D
Explanation:
Explanation
New Topology Change Mechanisms
When an 802.1D bridge detects a topology change, it uses a reliable mechanism to first
notify the root bridge.
This is shown in this diagram:

Once the root bridge is aware of a change in the topology of the network, it sets the TC flag
on the BPDUs it sends out, which are then relayed to all the bridges in the network. When
a bridge receives a BPDU with the TC flag bit set, it reduces its bridging-table aging time to
forward delay seconds. This ensures a relatively quick flush of stale information. Refer to
Understanding Spanning-Tree Protocol Topology Changes for more information on this
process. This topology change mechanism is deeply remodeled in RSTP. Both the
detection of a topology change and its propagation through the network evolve.
Topology Change Detection
In RSTP, only non-edge ports that move to the forwarding state cause a topology change.
This means that a loss of connectivity is not considered as a topology change any more,
contrary to 802.1D (that is, a port that moves to blocking no longer generates a TC). When
a RSTP bridge detects a topology change, these occur:
It starts the TC While timer with a value equal to twice the hello-time for all its non-edge
designated ports and its root port, if necessary.
It flushes the MAC addresses associated with all these ports.
Note: As long as the TC While timer runs on a port, the BPDUs sent out of that port have
the TC bit set.
BPDUs are also sent on the root port while the timer is active.
Topology Change Propagation
When a bridge receives a BPDU with the TC bit set from a neighbor, these occur:
It clears the MAC addresses learned on all its ports, except the one that receives the
topology change.
It starts the TC While timer and sends BPDUs with TC set on all its designated ports and root port (RSTP no longer uses the specific TCN BPDU, unless a legacy bridge needs to be notified). This way, the TCN floods very quickly across the whole network. The TC propagation is now a one step process. In fact, the initiator of the topology change floods this information throughout the network, as opposed to 802.1D where only the root did. This mechanism is much faster than the 802.1D equivalent. There is no need to wait for the root bridge to be notified and then maintain the topology change state for the whole network for <max age plus forward delay> seconds.

In just a few seconds, or a small multiple of hello-times, most of the entries in the CAM tables of the entire network (VLAN) flush. This approach results in potentially more temporary flooding, but on the other hand it clears potential stale information that prevents rapid connectivity restitution.
Reference http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf a.shtml
Topic 2, Implement IPv4

NEW QUESTION: 4
注：この質問は、同じシナリオを提示する一連の質問の一部です。シリーズの各質問には、述べられた目標を達成する可能性のある独自の解決策が含まれています。一部の質問セットには複数の正しい解決策がある場合がありますが、他の質問セットには正しい解決策がない場合があります。
このセクションの質問に回答した後は、その質問に戻ることはできません。その結果、これらの質問はレビュー画面に表示されません。
Azure App Service APIアプリを開発し、Developmentという名前のWindowsでホストされているデプロイスロットにデプロイします。 Testing andProductionという名前の追加のデプロイメントスロットを作成します。本番デプロイメントスロットで自動スワップを有効にします。
スワップ操作が発生する前に、スクリプトが実行され、リソースが使用可能であることを確認する必要があります。
解決策：自動スワップを無効にします。 statuscheckという名前のメソッドでアプリを更新して、スクリプトを実行します。自動スワップを再度有効にして、アプリを本番スロットにデプロイします。
ソリューションは目標を達成していますか？
A. いいえ
B. はい
Answer: B
Explanation:
Explanation
Instead update the web.config file to include the applicationInitialization configuration element. Specify custom initialization actions to run the scripts.
Note: Some apps might require custom warm-up actions before the swap. The applicationInitialization configuration element in web.config lets you specify custom initialization actions. The swap operation waits for this custom warm-up to finish before swapping with the target slot. Here's a sample web.config fragment.
<system.webServer>
<applicationInitialization>
<add initializationPage="/" hostName="[app hostname]" />
<add initializationPage="/Home/About" hostName="[app hostname]" />
</applicationInitialization>
</system.webServer>
Reference:
https://docs.microsoft.com/en-us/azure/app-service/deploy-staging-slots#troubleshoot-swaps