MCQs

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1. What is the full form of SIP in networking?
   a. Secured Initiation Protocol
   b. Secure Integration Protocol
   c. Session Integration Protocol
   d. Session Initiation Protocol
   Answer: d. Session Initiation Protocolsanfoundry+1
2. SIP is primarily used for which of the following?
   a. Managing IP addresses
   b. Initiating, maintaining, and terminating real-time sessions
   c. File transfer
   d. Network routing
   Answer: b. Initiating, maintaining, and terminating real-time sessionsccnatutorials+1
3. On which OSI layer does SIP operate?
   a. Network
   b. Data Link
   c. Transport
   d. Application
   Answer: d. Applicationscribd+1
4. Which protocol does SIP commonly work with to transport actual voice or media data?
   a. HTTP
   b. RTP
   c. SMTP
   d. FTP
   Answer: b. RTPscribd+1
5. Which of these is NOT a typical use-case of SIP?
   a. Voice over IP
   b. Video conferencing
   c. Remote desktop sharing
   d. Instant messaging
   Answer: c. Remote desktop sharingsanfoundry+1
6. What is the default port number used for SIP signaling (unencrypted)?
   a. 80
   b. 443
   c. 5060
   d. 21
   Answer: c. 5060ccnatutorials
7. SIP uses which kind of addressing to identify participants?
   a. MAC address
   b. IP address
   c. SIP URI
   d. Hostname
   Answer: c. SIP URIscribd+1
8. Which is the primary function of SIP?
   a. To route IP packets
   b. To setup, modify, or terminate multimedia sessions
   c. Encrypt data
   d. Authenticate users
   Answer: b. To setup, modify, or terminate multimedia sessionssanfoundry+1
9. SIP messages are exchanged using which protocol by default?
   a. TCP
   b. UDP
   c. Both TCP and UDP
   d. Neither TCP nor UDP
   Answer: c. Both TCP and UDPscribd+1
10. Which SIP response code indicates a successful request?
    a. 1xx
    b. 2xx
    c. 3xx
    d. 4xx
    Answer: b. 2xxccnatutorials
11. In SIP, what does a 200 OK response mean?
    a. Call is busy
    b. Call was successful
    c. Request timed out
    d. Incorrect credentials
    Answer: b. Call was successfulccnatutorials
12. What does the SIP “INVITE” request do?
    a. Terminates call
    b. Modifies session
    c. Initiates a call/session
    d. Registers a user
    Answer: c. Initiates a call/sessionscribd+1
13. Which entity in SIP handles call routing and forwarding?
    a. Registrar
    b. Proxy server
    c. Redirect server
    d. Mail server
    Answer: b. Proxy servertutorialspoint+1
14. Which of the following is NOT a SIP method?
    a. INVITE
    b. ACK
    c. BYE
    d. CONNECT
    Answer: d. CONNECTscribd+1
15. SIP uses which format for describing multimedia sessions?
    a. XML
    b. JSON
    c. SDP
    d. HTML
    Answer: c. SDPscribd
16. Which header in SIP is used to specify unique branches in routing?
    a. Via
    b. To
    c. From
    d. Call-ID
    Answer: a. Viascribd+1
17. What is the role of a SIP Registrar server?
    a. To authenticate calls
    b. To keep user location information
    c. To generate session keys
    d. To route calls
    Answer: b. To keep user location informationscribd+1
18. What does BYE request in SIP indicate?
    a. Call setup
    b. Modifying session
    c. Terminating the session
    d. Registering users
    Answer: c. Terminating the sessionccnatutorials
19. SIP request methods include all of the following except:
    a. REGISTER
    b. CANCEL
    c. DISCONNECT
    d. OPTIONS
    Answer: c. DISCONNECTccnatutorials+1
20. Which SIP component directs client requests to the appropriate destination?
    a. Proxy server
    b. USB bridge
    c. NAT
    d. Web server
    Answer: a. Proxy servertutorialspoint+1
21. What is the function of Record-Route header in SIP?
    a. To specify message encoding
    b. To force future requests in a dialog to go through specific proxies
    c. To authenticate calls
    d. To specify encryption type
    Answer: b. To force future requests in a dialog to go through specific proxiesscribd
22. SIP forks requests to multiple user agents using:
    a. Proxy forking
    b. Load balancer
    c. Registrar replication
    d. Multi-channel signaling
    Answer: a. Proxy forkingccnatutorials
23. Which response code class in SIP indicates redirection?
    a. 1xx
    b. 2xx
    c. 3xx
    d. 4xx
    Answer: c. 3xxccnatutorials
24. SIP messages can be sent over which protocol(s)?
    a. Only TCP
    b. Only UDP
    c. TCP or UDP
    d. Only ICMP
    Answer: c. TCP or UDPccnatutorials
25. In SIP, what is early dialog?
    a. Dialog after call is terminated
    b. Dialog established by non-final response
    c. Dialog with encryption only
    d. Dialog with only media established
    Answer: b. Dialog established by non-final responsescribd
26. What is the role of the SIP Contact header?
    a. Specifies multimedia type
    b. Indicates device location/contact URI
    c. Sets encryption key
    d. Denotes proxy address
    Answer: b. Indicates device location/contact URIscribd
27. What does a 404 Not Found SIP response indicate?
    a. Call successful
    b. Call redirected
    c. User not found
    d. Proxy unavailable
    Answer: c. User not foundccnatutorials
28. SIP supports which type(s) of communication?
    a. Unicast
    b. Multicast
    c. Both unicast and multicast
    d. Neither
    Answer: c. Both unicast and multicastccnatutorials
29. Which mechanism allows SIP to carry instant messaging?
    a. MESSAGE method
    b. INFO method
    c. UPDATE method
    d. CANCEL method
    Answer: a. MESSAGE methodccnatutorials
30. SIP uses which format to identify users?
    a. username@domain
    b. domain\username
    c. IP:port
    d. MAC address
    Answer: a. username@domainscribd+1
31. What is the SIP method to modify session parameters?
    a. UPDATE
    b. REGISTER
    c. INVITE (re-INVITE)
    d. BYE
    Answer: c. INVITE (re-INVITE)scribd+1
32. Which is a provisional SIP response?
    a. 180 Ringing
    b. 200 OK
    c. 301 Moved Permanently
    d. 404 Not Found
    Answer: a. 180 Ringingccnatutorials
33. What is the function of the SIP CANCEL method?
    a. Cancel ongoing session
    b. Cancel request currently pending
    c. Cancel user registration
    d. Cancel all active connections
    Answer: b. Cancel request currently pendingccnatutorials
34. SIP is flexible because it…
    a. Works only with TCP
    b. Interoperates with various media types
    c. Is hardware dependent
    d. Needs only one port
    Answer: b. Interoperates with various media typesmcqmate+1
35. What does the To header in SIP specify?
    a. Intended recipient
    b. Sender
    c. Proxy
    d. Media type
    Answer: a. Intended recipientscribd+1
36. What does the From header in SIP specify?
    a. Intended recipient
    b. Sender
    c. Proxy
    d. Media type
    Answer: b. Senderscribd+1
37. What happens if Max-Forwards reaches zero in a SIP request?
    a. Request proceeds normally
    b. Request is discarded
    c. Request triggers error
    d. Request is blocked
    Answer: b. Request is discardedscribd
38. SIP allows registering at multiple locations via:
    a. Multi-contact registration
    b. Forking
    c. Serial registration
    d. Parallel registration
    Answer: a. Multi-contact registrationccnatutorials
39. What is SDP in SIP?
    a. Session Description Protocol
    b. Simple Datagram Packet
    c. Secure Data Protocol
    d. Stateless Data Protocol
    Answer: a. Session Description Protocolscribd
40. What is the function of the SIP OPTIONS method?
    a. Query capabilities of another SIP device
    b. Terminate session
    c. Authenticate user
    d. Register device
    Answer: a. Query capabilities of another SIP devicescribd+1
41. Which header identifies unique SIP calls?
    a. Call-ID
    b. Via
    c. To
    d. From
    Answer: a. Call-IDccnatutorials+1
42. The SIP response code 486 indicates:
    a. Call completed
    b. User busy
    c. Call redirected
    d. Registration failed
    Answer: b. User busyccnatutorials
43. What is the role of Redirect Server in SIP?
    a. To manage session parameters
    b. To redirect SIP request to alternative contact address
    c. To modify SDP
    d. To store user credentials
    Answer: b. To redirect SIP request to alternative contact addressscribd
44. SIP uses which underlying transport protocols?
    a. Only TCP
    b. Only UDP
    c. Both TCP and UDP
    d. ICMP
    Answer: c. Both TCP and UDPccnatutorials
45. Which SIP response code indicates global failure?
    a. 5xx
    b. 6xx
    c. 4xx
    d. 3xx
    Answer: b. 6xxccnatutorials
46. Which of the following is a mandatory SIP header?
    a. User-Agent
    b. To
    c. Routing
    d. Encryption
    Answer: b. Toscribd+1
47. SIP supports mobility by allowing:
    a. Changing devices and locations
    b. Only one fixed device
    c. Only static IP addresses
    d. No support for roaming
    Answer: a. Changing devices and locationsccnatutorials
48. Each SIP message is encoded as:
    a. Binary data
    b. Plain text
    c. Encrypted XML
    d. Compressed JSON
    Answer: b. Plain textccnatutorials
49. Which SIP method is used by user agents to register themselves with a SIP registrar server?
    a. REGISTER
    b. INVITE
    c. UPDATE
    d. MESSAGE
    Answer: a. REGISTERscribd+1
50. SIP is an important protocol for:
    a. Starting, maintaining, and terminating real-time multimedia sessions over IP
    b. Encrypting all network traffic
    c. Establishing hardware connections
    d. Database management
    Answer: a. Starting, maintaining, and terminating real-time multimedia sessions over IPsanfoundry+1

1. https://www.sanfoundry.com/cyber-security-questions-answers-freshers/
2. https://testbook.com/question-answer/what-is-the-full-form-of-sip-in-voip–63772932fa9c4b1dee655e1c
3. https://ccnatutorials.in/application-layer-of-tcp-ip/sip-session-initiation-protocol/
4. https://www.scribd.com/doc/281804155/SIP-Interview-Questions
5. https://www.scribd.com/document/842983993/SIP-Questions
6. https://www.tutorialspoint.com/session_initiation_protocol/quiz_on_session_initiation_protocol_proxies_and_routing.htm
7. https://www.scribd.com/document/371823928/Questions-of-SIP
8. https://mcqmate.com/discussion/5068/session-initiation-protocol-sip-is-very
9. https://www.tutorialspoint.com/session_initiation_protocol/quiz_on_session_initiation_protocol_resources.htm
10. https://www.uninets.com/blog/computer-networks-mcq
11. https://www.interviewbit.com/computer-network-mcq/
12. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
13. https://www.sanfoundry.com/computer-network-questions-answers/
14. https://in.indeed.com/career-advice/interviewing/sip-interview-questions
15. https://examradar.com/network-management-snmp-mcq-data-communication-networking/
16. https://testbook.com/objective-questions/mcq-on-networking–5eea6a1639140f30f369f551
17. https://technicalblog.in/languagewise-mcqs/computer-network-programming/mcq-on-computer-networks/
18. https://testbook.com/objective-questions/mcq-on-internet-internet-protocols–64f9c109be446ffcbc1c7c42
19. https://www.sanfoundry.com/computer-networks-mcqs-application-layer/
20. https://www.sanfoundry.com/wireless-mobile-communications-questions-answers-network-protocols/