CMSC 137- Application Layer

出口

题 1 of 1

  剩下的时间


0 [{"id":625230,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:03:31","updated_at":"2018-11-24 09:13:31","questionName":"what is?\r\nThe information contained in the domain name space must be stored. However, it is very inefficient and also unreliable to have just one computer store such a huge amount of information.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"5","questionImagePath":null,"position":8,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625224,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 07:59:21","updated_at":"2018-11-24 09:13:31","questionName":"To be unambiguous, the names assigned to machines must be carefully selected from a name space with complete control over the binding between the names and IP addresses.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"4","questionImagePath":null,"position":2,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625227,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:00:54","updated_at":"2018-11-24 09:13:31","questionName":"each name is made of several parts\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":5,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625226,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:00:34","updated_at":"2018-11-24 09:13:31","questionName":"what is?\r\na name is assigned to an address\r\na name in this space is a sequence of characters without structure\r\nit cannot be used in a large system such as the Internet because it must be centrally controlled to avoid ambiguity and duplication.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":4,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625235,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:07:03","updated_at":"2018-11-24 09:13:31","questionName":"There are several root servers, each covering the a part of domain name space.\r\ntrue or false?","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":13,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625228,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:01:25","updated_at":"2018-11-24 09:13:31","questionName":"To have a hierarchical name space, a ___________ was designed. In this design the names are defined in an inverted-tree structure with the root at the top. The tree can have only 128 levels: level 0 (root) to level 127.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"4","questionImagePath":null,"position":6,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625233,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:05:49","updated_at":"2018-11-24 09:13:31","questionName":"A ___________ is a server whose zone consists of the whole tree.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":11,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625236,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:07:48","updated_at":"2018-11-24 09:13:31","questionName":"In root server, the servers are distributed all around the world.\r\ntrue or false?","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":14,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625225,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:00:02","updated_at":"2018-11-24 09:13:31","questionName":"A name space that maps each address to a unique name can be organized in two ways:\r\n(2)","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":3,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625222,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 07:58:01","updated_at":"2018-11-24 09:13:31","questionName":"The client\/server programs can be divided into two categories:\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":0,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625232,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:05:15","updated_at":"2018-11-24 09:13:31","questionName":"If the domain is not divided into smaller domains, domain and zone refer to the same thing.\r\ntrue or false?\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":10,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625223,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 07:58:25","updated_at":"2018-11-24 09:13:31","questionName":"___________________is a supporting program that is used by other programs such as e-mail.\r\n","questionTimeSeconds":"0","questionTimeMinutes":"4","questionImagePath":null,"position":1,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625234,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:06:21","updated_at":"2018-11-24 09:13:31","questionName":"A root server usually does not store any\r\ninformation about domains but delegates its authority to other servers, keeping references to those servers.\r\ntrue or false?","questionTimeSeconds":"0","questionTimeMinutes":"4","questionImagePath":null,"position":12,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625229,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:02:09","updated_at":"2018-11-24 09:13:31","questionName":"2 kinds of domains","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":7,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null},{"id":625231,"quiz_id":"30656","answer_id":null,"answerType_id":"4","created_at":"2018-11-24 08:04:53","updated_at":"2018-11-24 09:13:31","questionName":"what is?\r\nwhat a server is responsible for or has authority over; contiguous part of the entire tree\r\n\r\n","questionTimeSeconds":"0","questionTimeMinutes":"3","questionImagePath":null,"position":9,"explanation":"","question_score_id":null,"lang":"","questionAudioPath":null}]
625230
0
300
block

按卡将其翻转。

what is? The information contained in the domain name space must be stored. However, it is very inefficient and also unreliable to have just one computer store such a huge amount of information.

DISTRIBUTION OF NAME SPACE





你做对了吗?





625224
0
240
none
625227
0
180
none
625226
0
180
none
625235
0
180
none
625228
0
240
none
625233
0
180
none
625236
0
180
none
625225
0
180
none
625222
0
180
none
625232
0
180
none
625223
0
240
none
625234
0
240
none
625229
0
180
none
625231
0
180
none