Ch6 IPv6 Neighbor Discovery | Test Bank – 4th Edition

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Chapter 3: Basic IP Packet Structures: Header and Payloads

Student: ___________________________________________________________________________

1. The Internet Protocol (IP) primarily works to transmit and deliver data between devices on internetworks. 
True    False

2. Because PHB is independent of how individual routers are configured, the end-to-end behavior of traffic is predictable. 
True    False

3. When a packet is sent between two ECN-capable routers, the packet is usually marked ECT(0) or ECT(10) for ECN Capable Transport. 
True    False

4. Though defined in terms of seconds, a TTL value is implemented as a number of hops that a packet can travel before being discarded by a router. 
True    False

5. Unlike IPv4 packets, IPv6 packets ensure that data or application information is successfully transported from a source to a destination node on a network. 
True    False

6. The header can be between 20 and ____ bytes in length, with total packet size up to 65,535 bytes in length. 
A. 50
B. 60
C. 70
D. 80

7. There are ____ fields possible in the IPv4 header. 
A. 14
B. 15
C. 19
D. 21

8. The Type of Service field actually has two components: Precedence and ____. 
A. Trailer
B. Type of Service
C. Payload
D. Frame

9. The last bit of the entire Type Of Service field is reserved and set at 0, as specified by RFC ____. 
A. 1129
B. 1294
C. 1349
D. 1439

10. RFC ____ defines a method for differentiating services for network traffic using the six high-order bits of the byte that was formerly the 3-bit Precedence field and the first bit of the TOS field. 
A. 1212
B. 1974
C. 2156
D. 2474

11. The ____ field defines the length of the IP header and any valid data (although it does not include any data link padding). 
A. Header Length
B. Frame Length
C. Packet Length
D. Total Length

12. In networking terms, a packet’s ____ is the remaining distance that the packet can travel. 
A. time to live (TTL)
B. number of hops (NOH)
C. offset
D. remaining path

13. In IPv4 the maximum time to live value is ____. 
A. 64
B. 128
C. 255
D. 312

14. The specifications for IPv6, including the header format, were established in RFC 1883, which was subsequently made obsolete by RFC ____. 
A. 1983
B. 2460
C. 2517
D. 3114

15. The fixed IPv6 header makes up the first ____ octets or 320 bits of the IPv6 packet. 
A. 8
B. 16
C. 32
D. 40

16. The 8-bit ____ field is used by source network hosts and forwarding routers to distinguished classes or priorities in IPv6 packets. 
A. Hop Limit
B. Payload Class
C. Traffic Class
D. Flow Label

17. RFC ____ is the proposed standard for the Flow Label specification and defines the minimum requirements for this field. 
A. 3697
B. 4545
C. 4554
D. 5674

18. IPv6 jumbograms are specified in RFC ____ as a proposed standard. 
A. 1100
B. 1700
C. 2314
D. 2675

19. The 8-bit ____ field specifies the header type of the header immediately following the IPv6 header. 
A. Next Header
B. Payload Class
C. Traffic Class
D. Header Type

20. The value in the 8-bit ____ field decrements by one each time it is forwarded by a network node, and the IPv6 packet is discarded if the value in this field reaches 0. 
A. Hop Count
B. Time to Live
C. Hop Limit
D. Time Limit

21. In IPv6, each extension header is identified by a specific ____ value. 
A. Traffic Class
B. Next Header
C. Payload Header
D. Traffic Header

22. The ____ extension header is designed to carry information that affects routers along a path. 
A. Hop-by-Hop Options
B. Jumbograms
C. Next Header Options
D. Traffic Class

23. The ____ extension header provides a method for extending the IPv6 header to support options for packet handling and preferences. 
A. Extended Header Options
B. Destination Options
C. Hop-by-Hop Options
D. Next Payload Options

24. The fields of the Fragment extension header are almost identical to the IPv4 fragment fields except for the use of the ____ field. 
A. Next Header
B. Fragment Offset
C. Flags
D. Reserved

25. In IPv6, the ____ extension header should be used to encrypt data. 
A. Cryptographic
B. Authentication Data
C. Secure Payload
D. Encapsulating Security Payload

26. Jumbograms use the ____ extension header to add an alternate Packet Length field of 32 bytes. 
A. Option Type
B. Hop-by-Hop Options
C. Header Offset
D. Next Packet Length

27. A(n) _________________________ is a router buffering system used to hold packets when the router is congested. 
________________________________________

28. _________________________ was designed to provide devices with a method for notifying each other that a link is experiencing congestion before the routers start to drop packets. 
________________________________________

29. If the packet is a fragment, the _________________________ field shows where to place this packet’s data when the fragments are reassembled into a single packet. 
________________________________________

30. A(n) _________________________ is a set of packets for which a source requires special handling by the intervening routers. 
________________________________________

31. _________________________ allow additional functionality to be implemented in an IPv6 packet. 
________________________________________

32. Match each item with a statement below. 

33. Describe the IPv4 Header Length field. 

34. What is a real-time application (RTA)? 

35. What is the purpose of the Identification field in IPv4? 

36. Is packet fragmentation in IPv4 a good thing? 

37. Briefly describe the Protocol field in the IPv4 header. 

38. What are the general requirements for the Traffic Class field in an IPv6 header? 

39. What is the role of the Next Header field in IPv6? 

40. What is the recommended extension header ordering in IPv6? 

41. Briefly describe the IPv6 Authentication extension header. 

42. What is “6to4”? 

Chapter 3: Basic IP Packet Structures: Header and Payloads