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Indicate whether the statement is true or false.
1. Because PHB is independent of how individual routers are configured, the end-to-end behavior of traffic is
predictable.
a.
True
b.
False
2. 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.
a.
True
b.
False
3. Unlike IPv4 packets, IPv6 packets ensure that data or application information is successfully transported from
a source to a destination node on a network.
a.
True
b.
False
4. When a packet is sent between two ECN-capable routers, the packet is usually marked ECT(0) or ECT(10)
for ECN Capable Transport.
a.
True
b.
False
5. The Internet Protocol (IP) primarily works to transmit and deliver data between devices on internetworks.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. Which of the following is a special marker with which traffic can be prioritized by an end device or boundary
device and queued and forwarded according to this value?
a.
DSCP
b.
ECN
c.
CE
d.
IHL
7. Which 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
8. In IPv4, what is the maximum time to live value?
a.
64
b.
128
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c.
255
d.
312
9. Jumbograms use which of the following extension headers 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
10. Which RFC is used to define 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. In IPv6, which extension header should be used to encrypt data?
a.
Cryptographic
b.
Authentication Data
c.
Secure Payload
d.
Encapsulating Security Payload
12. Which 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
13. Which IPv6 header includes fields for the intermediary addresses through which the IPv6 packet should be
forwarded?
a.
Routing extension
b.
Destination Options
c.
Hop-by-Hop Options
d.
Fragment extension
14. Which field in an IPv6 packet is used by source network hosts and forwarding routers to distinguished
classes or priorities?
a.
Hop Limit
b.
Payload Class
c.
Traffic Class
d.
Flow Label
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15. In IPv6, each extension header is identified by a specific value known as which of the following.
a.
Traffic Class
b.
Next Header
c.
Payload Header
d.
Traffic Header
16. The Type of Service field actually has two components: Precedence and which of the following?
a.
Trailer
b.
Type of Service
c.
Payload
d.
Frame
17. The header can be between 20 and how many bytes in length?
a.
50
b.
60
c.
70
d.
80
18. IPv6 jumbograms are specified as a proposed standard in which of the following RFCs?
a.
1100
b.
1700
c.
2314
d.
2675
19. The fields of the Fragment extension header are almost identical to the IPv4 fragment fields except for the
use of which field?
a.
Next Header
b.
Fragment Offset
c.
Flags
d.
Reserved
20. Which 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
21. In networking terms, the remaining distance that the packet can travel is known as which of the following?
a.
time to live (TTL)
b.
number of hops (NOH)
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c.
offset
d.
remaining path
22. The value in which of the following fields will decrement 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
23. What field in the basic IPv6 header is used to chain additional headers?
a.
Chain Header
b.
Next Header
c.
Header PTR
d.
Extensions
24. 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
25. How many possible fields can be contained in an IPv4 header?
a.
14
b.
15
c.
19
d.
21
26. The fixed IPv6 header of an IPv6 packet is made up of how many octets?
a.
8
b.
16
c.
32
d.
40
Enter the appropriate word(s) to complete the statement.
27. 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.
28. A(n) _________________________ is a set of packets for which a source requires special handling by the
intervening routers.
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29. _________________________ 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.
30. A(n) _________________________ is a router buffering system used to hold packets when the router is
congested.
31. _________________________ allow additional functionality to be implemented in an IPv6 packet.
Match each item with a statement below.
a.
Voice over IP (VoIP)
b.
per-hop behavior (PHB)
c.
Fragment Offset field
d.
Maximum Datagram Lifetime (MDL)
e.
6to4
f.
precedence
g.
path MTU (PMTU) Discovery
h.
Jumbogram
i.
time to live (TTL)
32. a communications technology that allows voice and multimedia communication sessions over IP networks
(e.g., the Internet or an intranet)
33. a way of describing protocols and priorities applied to a packet on traversing a router "hop"
34. the field that defines where a fragment should be placed when the entire data set is reassembled
35. the longest period of time a datagram may exist
36. a method of allowing IPv6 network nodes to communicate with each other over an IPv4 network by special
encapsulation of IPv6 packets
37. a definition of priority for an IP packet
38. a technique used by IPv6 nodes to determine the size of packets that can be transmitted along a proposed
network path from a source to a network address
39. a specification for allowing very large (beyond 4-gigabyte) packets to be transported using IPv6
40. an indication of the remaining distance that a packet can travel
41. What is the recommended extension header ordering in IPv6?
42. What is the purpose of the Identification field in IPv4?
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43. Briefly describe the Protocol field in the IPv4 header.
44. Briefly describe IGMP.
45. What is "6to4"?
46. Describe the IPv4 Header Length field.
47. What is a real-time application (RTA)?
48. What are the general requirements for the Traffic Class field in an IPv6 header?
49. What is the role of the Next Header field in IPv6?
50. Briefly describe the IPv6 Authentication extension header.
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Answer Key
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