Which statement is true about accessing a Juniper enterprise router using a Web browser?（）

A、J-series routers are accessible by default.

B、M7i and M10i routers are accessible by default.

C、You need to install a license before accessing a J-series router.

D、You need to enable the HTTP service on M7i, M10i, and J-series routers before accessing them.

What is the result？ （）

A、  The program prints “lava”.

B、  The program prints “java”.

C、  An error at line 7 causes compilation to fail.

D、  Complication succeeds but the program throws an exception.

Which the two are true regarding a web application class loader？（）

 A web application may override the web container’s implementation classes

 A web application running in a J2EE product may override classes in the javax.* namespace

 A web application class loader may NOT override any classes in the java.* and javax.*  namespace

 Resources in the WAR class directory or in any of the JAR files within the library directory may  be accessed using the J2SE semantics of getResource

 Resources in the WAR class directory or in any of the JAR files within the library directory  cannot be accessed using the J2SE semantics of getResource

Assume that a news tag library contains the tags lookup and item：  Lookup Retrieves the latest news headlines and executes the tag body once for each headline. Exposed a NESTED page-scoped attribute called headline of type com.example. Headline containing details for that headline.  Item Outputs the HTML for a single news headline. Accepts an attribute info of type com.example. Headline containing details for the headline to be rendered. Which snippet of JSP code returns the latest news deadlines in an HTLM table， one per row？（）

A、 A

B、 B

C、 C

D、 D

Which two statements about the Adaptive Services PIC are true? （）

The Adaptive Services PIC supports the Layer 3 service package by default.

The Adaptive Services PIC is required when using the secure shell to access an M-series router.

The Adaptive Services PIC can be configured for the Layer 2 and Layer 3 service packages simultaneously.

The Adaptive Services PIC can be configured for either the Layer 2 or the Layer 3 service package but not both at the same time.

具有3个结点的二叉树有（　　）。

A、2种形态

B、4种形态

C、7种形态

D、5种形态