trắc nghiệm 120-159

Câu 121: Which one of the following is not used to generate dynamic web pages?

• a) PHP
  

• b) ASP.NET
  

• c) JSP
  

• d) CSS
  

An alternative to JavaScript on windows platform is _______

• a) VBScript
  

• b) ASP.NET
  

• c) JSP
  

• d) PHP
  

Câu 123: What is document object model (DOM)?

• a) convention for representing and interacting with objects in html documents
  

• b) application programming interface
  

• c) hierarchy of objects in ASP.NET
  

• d) scripting language

Câu 124: The TTL field has value 10. How many routers (max) can process this datagram?

• 11

• 5

• 10

• 1

Câu 125: If the value in protocol field is 17, the transport layer protocol used is _____________

• a) TCP
  

• b) UDP
  

• c) ICMP
  

• d) IGMP
  

Câu 126: The data field cannot carry which of the following?

• a) TCP segment
  

• b) UDP segment
  

• c) ICMP messages
  

• d) SMTP messages
  

Câu 127: What should be the flag value to indicate the last fragment?

• a) 0
  

• b) 1
  

• c) TTl value
  

• d) Protocol field value
  

Câu 128: Which of these is not applicable for IP protocol?

• a) is connectionless
  

• b) offer reliable service
  

• c) offer unreliable service
  

• d) does not offer error reporting
  

Câu 129: Which of the following demerits does Fragmentation have?

• a) complicates routers
  

• b) open to DOS attack
  

• c) overlapping of fragments.
  

• d) all of the mentioned
  

Câu 130: Which field helps to check rearrangement of the fragments?

• a) offset
  

• b) flag
  

• c) ttl
  

• d) identifer