What is the primary function of the control plane in a Software-Defined Networking (SDN) architecture?
- Data forwarding
- Network management
- Control and decision-making
- Physical device configuration
The control plane in SDN is responsible for control and decision-making, separating it from the data plane for flexibility and programmability.
________ is a network device that strengthens the signal along a network cable and works on the principle of signal regeneration.
- Bridge
- Hub
- Modem
- Repeater
A Repeater is a network device that strengthens the signal along a network cable and works on the principle of signal regeneration.
A network administrator is tasked with designing a subnetting scheme for a university campus. The scheme needs to efficiently accommodate varying sizes of departments and user groups. What approach should they adopt?
- CIDR (Classless Inter-Domain Routing)
- Classful Subnetting
- Supernetting
- Variable Length Subnet Masking (VLSM)
Variable Length Subnet Masking (VLSM) is suitable for accommodating varying sizes of departments and user groups in a subnetting scheme for a university campus.
What is a key benefit of implementing TACACS+ in AAA?
- Centralized Authentication
- Encryption of Data
- Load Balancing
- Port Security
TACACS+ provides centralized authentication, which is a key benefit in AAA (Authentication, Authorization, and Accounting) systems.
Is it possible to extend a class defined as final?
- No, you cannot extend a class that is declared as final.
- Yes, you can extend a final class.
- You can extend a final class only in the same package.
- You can extend a final class, but it requires special annotations.
In Java, a class declared as "final" cannot be extended. The "final" keyword indicates that the class cannot be subclassed. Attempting to extend a final class will result in a compile-time error. This feature is often used when you want to prevent further modification or extension of a class, such as in utility classes or classes that are critical to the design.
Which method is used to retrieve the protocol type of a URL in Java?
- fetchProtocol()
- getProtocol()
- getURLProtocol()
- retrieveProtocol()
In Java, to retrieve the protocol type of a URL, you should use the getProtocol() method of the URL class. It returns a String containing the protocol, such as "http," "https," "ftp," etc. The other options do not exist as valid methods for this purpose.
Can we overload the "+" operator to concatenate two strings and add two integers in a custom class?
- No, Java does not support operator overloading.
- Yes, by defining a method named + in the custom class.
- Yes, by defining methods named add and concatenate for the custom class.
- Yes, by using the + operator with different parameter types in the method definition.
No, Java does not support operator overloading. In Java, the + operator is not overloaded for user-defined classes. The + operator is only used for addition when applied to numeric data types and for string concatenation when used with strings. Therefore, you cannot define custom behavior for the + operator in user-defined classes.
Does Java support operator overloading?
- No, not at all.
- Only for arithmetic ops.
- Yes, for all operators.
- Yes, for selected ops.
Java does not support operator overloading for custom classes. While some languages do allow operator overloading, Java enforces a fixed set of operators for built-in types, and you cannot create custom operator overloads. This limitation helps maintain code readability and prevents ambiguity.
How can we handle SQL exceptions that may occur during the execution of a JDBC program?
- Ignore them and let the program continue
- Use assert statements to handle exceptions
- Use if-else statements to handle exceptions
- Use try-catch blocks to catch and handle exceptions
SQL exceptions in a JDBC program should be handled using try-catch blocks. Ignoring them can lead to unexpected program behavior, and try-catch allows you to gracefully handle errors, log them, or take corrective actions. The other options are not recommended approaches for handling exceptions in JDBC.
To write primitive data types like int or double to a file in a machine-independent way, you might use ________.
- DataOutputStream
- FileInputStream
- ObjectInputStream
- ObjectOutputStream
To write primitive data types to a file in a machine-independent way, you can use DataOutputStream. It provides methods for writing different data types to a file while ensuring that the data can be read back correctly.