参考答案和解析
正确答案:手机做主叫
更多“当TREE=2表示()。”相关问题
  • 第1题:

    当Esc键与单击该命令按钮作用相同时,此命令按钮的什么属性被设置为 Tree?

    A.Style

    B.Default

    C.Caption

    D.Cancel


    正确答案:D
    解析:在一个窗体中,只能有一个命令按钮的Cancel属性设为True,当一个命令按钮的Cancel属性被设置为True时,单击该命令按钮与按Esc键的作用是相同的,可见答案D)是正确的。另外3个属性的作用分别是:Style:决定按钮显示方式,分标准和图形方式两种。Defalt:当命令按钮的Defalt属性设置为True时,若焦点不在任何命令按钮上,则单击命令按钮与按Enter键的作用相同。Caption:用来设置显示在命令按钮上的文本。

  • 第2题:

    Traversing a binary tree in preorder is equivalent to(68).

    A.Traversing the forest corresponding to the binary tree in root-first order

    B.Traversing the forest corresponding to the binary tree in root-last order

    C.Traversing the forest corresponding to the binary tree in breadth-first order

    D.None of the above


    正确答案:A
    解析:前序遍历一个二叉树等价于按从树的根部、右子树、右子树查找顺序查找树。

  • 第3题:

    You are a network techn ician, study the exhibit carefully. All multilayer switches are running PIM sparse mode. Host CKB and Host CKF are sending IGMPv2 join messages to their respective multilayer switches. Which description is correct?()

    A. Switches 1, 2, 3, and 6 will part icipate in the multicast tree once pruning has taken place.

    B. Switches 2 and 6 will participate in the multicast tree once pruning has taken place.

    C. Switches 1, 2, 3, and 6 will participate in the multicast tree.

    D. The multicast server is the rendez vous point of the multicast tree.


    参考答案:C

  • 第4题:

    Which command enhances the 802.1D convergence time on ports that are connected to hosts?()

    A. spanning-tree backbonefast

    B. spanning-tree uplinkfast

    C. spanning-tree portfast

    D. spanning-tree cost512


    参考答案:C

  • 第5题:

    Which command enables RSTP on aswitch?()

    A.spanning-tree mode rapid-pvst

    B.spanning-tree uplinkfast

    C.spanning-tree backbonefast

    D.spanning-tree mode mst


    参考答案:A

  • 第6题:

    Which two of these statements correctly describe classic PIM-SM?()

    • A、The IOS default is for a last-hop router to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.
    • B、The IOS default is for every one of the routers on the shared tree to trigger a switch to the shortest path tree as soon as a new source is detected on the shared tree.
    • C、The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "infinity."
    • D、The default behavior of switching to the shortest path tree as soon as a new source is detected on the shared tree can be disabled by setting the value in the ip pim spt-threshold command to "zero."

    正确答案:A,C

  • 第7题:

    Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs?()

    • A、spanning-tree guard root
    • B、spanning-tree portfast bpduguard default
    • C、spanning-tree bpduguard enable
    • D、spanning-tree bpdufilter enable
    • E、spanning-tree portfast bpdufilter default

    正确答案:E

  • 第8题:

    现有:  class Tree {  private static String tree = "tree ";  String getTree ()  {  return tree;  }       }  class Elm extends Tree {  private static String tree = "elm ";  public static void main (String  []  args)  {       new Elm() .go (new Tree())  ;      } }  void go (Tree t)  {  String  s =  t.getTree () +Elm.tree  +  tree  +   (new  Elm() .getTree ()) ;      System.out.println (s) ;}     结果为:()                 

    • A、 elm elm elm elm
    • B、 tree elm elm elm
    • C、 tree elm elm tree
    • D、 tree elm tree elm

    正确答案:C

  • 第9题:

    Which command enhances the 802.1D convergence time on ports that are connected to hosts?()

    • A、spanning-tree backbonefast
    • B、spanning-tree uplinkfast
    • C、spanning-tree portfast
    • D、spanning-tree cost512

    正确答案:C

  • 第10题:

    final class Tree {  private static String tree = "tree ";  String getTree() { return tree; }  }  class Elm extends Tree {  private static String tree = "elm "; public static void main(String [] args) {  new Elm().go(new Tree());  }  void go(Tree t) {  String s = t.getTree()+Elm.tree+tree+(new Elm().getTree());  System.out.println(s);  } }  结果为:() 

    • A、elm elm elm elm
    • B、tree elm elm elm
    • C、tree elm tree elm
    • D、编译失败

    正确答案:D

  • 第11题:

    单选题
    现有:  class Tree {  private static String tree = "tree ";  String getTree ()  {  return tree;  }       }  class Elm extends Tree {  private static String tree = "elm ";  public static void main (String  []  args)  {       new Elm() .go (new Tree())  ;      } }  void go (Tree t)  {  String  s =  t.getTree () +Elm.tree  +  tree  +   (new  Elm() .getTree ()) ;      System.out.println (s) ;}     结果为:()
    A

     elm elm elm elm

    B

     tree elm elm elm

    C

     tree elm elm tree

    D

     tree elm tree elm


    正确答案: C
    解析: 暂无解析

  • 第12题:

    单选题
    哪个命令可以在交换机启用RSTP? ()
    A

     spanning-tree mode rapid-pvst

    B

     spanning-tree uplinkfast

    C

     spanning-tree backbonefast

    D

     spanning-tree mode mst


    正确答案: A
    解析: 暂无解析

  • 第13题:

    Windows基本操作题(共5小题,每小题2分,共10分。)

    (1)在D盘根下建立NL文件夹,在NL文件夹下建立Bl子文件夹和B2子文件夹。

    (2)在Bl下建立一个名为TREE. txt空文本文件。

    (3)将B1中的文件TREE. txt复制到B2中,将B2中TREE. txt的改名为PPT. txt。

    (4)将Bl中的文件TREE. txt删除,然后从回收站中还原。

    (5)将B2中EXOT3. txt的属性设置为隐藏。


    正确答案:

    1.【参考答案】本题为上机操作题,具体略。

  • 第14题:

    考虑如下代码:

    class Tree{}

    class Pine extends Tree{}

    class Oak extends Tree{}

    public class Forest {

    public static void main( String[] args ) {

    Tree tree = new Pine();

    if( tree instanceof Pine )

    System.out.println( "Pine" );

    if( tree instanceof Tree )

    System.out.println( "Tree" );

    if( tree instanceof Oak )

    System.out.println( "Oak" );

    else

    System.out.println( "Oops" );

    }

    }

    则输出结果中有哪些?

    A.Pine B.Tree C.Forest D.Oops E.无输出


    正确答案:ABD

  • 第15题:

    Refer to the exhibit. All multilayer switches are running PIM dense mode. Recipient A and Recipient B are sending IGMPv2 joi n messages to their respective multilayer switches. Which statement is true?()

    A. The Multicast Server is the root of the multicast tree. Switches 1, 3, 4, and 5 will participate in the multicast tree once pruning has taken place.

    B. The Multicast Serv er is the root of the multicast tree. Switches 4 and 5 will participate in the multicast tree once pruning has taken place.

    C. Switch 3 is the root of the multicast tree. Switches 3,4, and 5 will participate in the multicast tree once pruning has taken place.

    D. Switch 3 is the root of the multicast tree. Switches 1,3,4, and 5 will participate in the multicast tree once pruning has taken place.

    E. Switch 1 is the root of the multicast tree. Switches 1,4, and 5 will participate in the multicast tree once pruning has taken place.

    F. Switch 1 is the root of the multicast tree. Switches 1,3,4, and 5 will participate in the multicast tree once pruning has taken place.


    参考答案:A

  • 第16题:

    Which command enables RSTP on a switch?()

    A. spanning-tree mode rapid-pvst

    B. spanning-tree uplinkfast

    C. spanning-tree backbonefast

    D. spanning-tree mode mst


    参考答案:A

  • 第17题:

    The cottonwood tree Mr. Flanagan found was an extremely tall tree with broad leaves.


    正确答案:

  • 第18题:

    当VPMN用户发起主叫时,被叫号码是在()送往SCP处理。

    • A、预分析后
    • B、预分析前
    • C、TREE分析后
    • D、TREE分析前

    正确答案:B

  • 第19题:

    What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations?()

    • A、immediately after receiving the first packet on the shared tree for a given (S,G)
    • B、after receiving over 1 kb/s traffic onthe shared tree for a given (S,G)
    • C、10 seconds after receiving the first packet on the shared tree for a given (S,G)
    • D、30 seconds after receiving the first packet on the shared tree for a given (S,G)
    • E、after receiving over 10 kb/s traffic onthe shared tree for a given (S,G)

    正确答案:A

  • 第20题:

    Which command enables RSTP on a switch?()

    • A、spanning-tree mode rapid-pvst
    • B、spanning-tree uplinkfast
    • C、spanning-tree backbonefast
    • D、spanning-tree mode mst

    正确答案:A

  • 第21题:

    Which two statements about the various implementations of STP are true?()

    • A、mon Spanning Tree maintains a separate spanning-tree instance for each VLAN configured in the network.
    • B、The Spanning Tree Protocol (STP) is an evolution of the IEEE 802.1w standard.
    • C、Per-VLAN Spanning Tree (PVST) supports 802.1Q trunking.
    • D、Per-VLAN Spanning Tree Plus(PVST+) is an enhancement to 802.1Q specification and is supported only on Cisco devices.
    • E、Rapid Spanning Tree Protocol (RSTP) includes features equivalent to Cisco PortFast, UplinkFast, and BackboneFast for faster network reconvergence.
    • F、Multiple Spanning Tree (MST) assumes one spanning-tree instance for the entire Layer 2 network, regardless of the multiple number of VLANs

    正确答案:D,E

  • 第22题:

    单选题
    final class Tree {  private static String tree = "tree ";  String getTree() { return tree; }  }  class Elm extends Tree {  private static String tree = "elm "; public static void main(String [] args) {  new Elm().go(new Tree());  }  void go(Tree t) {  String s = t.getTree()+Elm.tree+tree+(new Elm().getTree());  System.out.println(s);  } }  结果为:()
    A

    elm elm elm elm

    B

    tree elm elm elm

    C

    tree elm tree elm

    D

    编译失败


    正确答案: C
    解析: 暂无解析

  • 第23题:

    单选题
    What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations?()
    A

    immediately after receiving the first packet on the shared tree for a given (S,G)

    B

    after receiving over 1 kb/s traffic onthe shared tree for a given (S,G)

    C

    10 seconds after receiving the first packet on the shared tree for a given (S,G)

    D

    30 seconds after receiving the first packet on the shared tree for a given (S,G)

    E

    after receiving over 10 kb/s traffic onthe shared tree for a given (S,G)


    正确答案: D
    解析: 暂无解析