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NEW QUESTION: 1



A. public int getId ()
public String getContractDetails()
public String getName()
public Person getPerson(int id) throws Exception
B. public in getId ()
public String getContractDetails ()
public Void setContractDetails(String contactDetails)
public String getName ()
public void setName (String name)
C. public void setContractDetails(String contractDetails) public void setName(String name)
D. public Person getPerson(int id) throws Exception
public void createPerson(Person p) throws Exception
public void deletePerson(int id) throws Exception
public void updatePerson(Person p) throws Exception
Answer: D
Explanation:
The methods related directly to the entity Person is moved to a new class.
CRUD
Note:DAO Design Pattern
*Abstracts and encapsulates all access to a data source *Manages the connection to the
data source to obtain
and store data *Makes the code independent of the data sources and data vendors (e.g.
plain-text, xml, LDAP,
MySQL, Oracle, DB2)

Example (here Customer is the main entity):
public class Customer {
private final String id;
private String contactName;
private String phone;
public void setId(String id) { this.id = id; }
public String getId() { return this.id; }
public void setContactName(String cn) { this.contactName = cn;} public String getContactName() { return this.contactName; } public void setPhone(String phone) { this.phone = phone; } public String getPhone() { return this.phone; } } public interface CustomerDAO { public void addCustomer(Customer c) throws DataAccessException; public Customer getCustomer(String id) throws DataAccessException; public List getCustomers() throws DataAccessException; public void removeCustomer(String id) throws DataAccessException; public void modifyCustomer(Customer c) throws DataAccessException; } 57

NEW QUESTION: 2
You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but it does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel 52 in the same work areas. What is the likely problem?
A. The clients are configured to use WPA and 5 GHz channels only support WPA2
B. The client drivers are faulty and should be upgraded
C. The access points are configured to disallow 5 GHz
D. The antennas in the laptops have insufficient gain to detect the 5 GHz signals
Answer: A

NEW QUESTION: 3
次のうちどれがフロー制御の種類ですか？ （3つ選んでください。）
A. カットスルー
B. バッファリング
C. 窓掛け
D. 輻輳回避
E. ロードバランス
Answer: B,C,D
Explanation:
説明/参照：
Explanation:
http://www.info-it.net/cisco/ccna/exam-tips/flow-control.php
データの転送中、高速コンピュータはネットワークデバイスが宛先への転送で処理できるよりもはるかに速くデータトラフィックを生成しているので、単一のゲートウェイまたは宛先デバイスは「輻輳」と呼ばれる大量のトラフィックを処理できません。
バッファリング
Technieは、輻輳が発生したとき、ネットワークデバイスがメモリセクションに格納したデータを受信したときに、「バッファリング」と呼ばれるこのプロセスに転送するときに、データ転送を制御するために使用されます。
ウィンドウ処理ウィンドウ処理はトランスポート層によるフロー制御に使用されます。送信側デバイスがセグメントを送信していて、受信側デバイスがそれをさらに受け入れることができるようになる前に固定数のセグメントしか収容できないとすると、2つのデバイスは接続設定中にウィンドウサイズをネゴシエートします。
これは、送信側デバイスが受信側デバイスのバッファをオーバーフローしないようにするために行われます。また、受信側デバイスは、受信したすべてのセグメントの後に確認応答を送信する代わりに、受信したセグメントに対して1つの確認応答を送信できます。また、このウィンドウサイズは動的な意味であり、デバイスはセッションの途中でウィンドウサイズをネゴシエートおよび変更できます。したがって、最初にウィンドウサイズが3で、受信側デバイスがバッファ内でより多くのセグメントを受け入れることができると考えた場合、送信側デバイスとネゴシエートして、たとえば5に増やすことができます。 UDPはフロー制御を使用または許可しないため、ウィンドウ処理はTCPによってのみ使用されます。