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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is IANA?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Internet Assigned Numbers Authority
Router Advertisement
Subtract Header Length field from Total Length field

2. What is the IPv4 Protocol number for GRE?
Sequence Number
LIRs
47
Time Exceeded

3. Which IPv4 address range is reserved for use in documentation and example code?
1
Router(config)#arp {ip-address} {mac-address} arpa
DHCP
192.0.2.0/24

4. What is proxy ARP?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Redirect
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Padding of zeros to ensure that the header ends on a 32-bit boundary

5. Who allocates public IP address ranges to NIRs or LIRs?
IANA
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Regional Internet Registry
RIRs

6. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
Sequence Number
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Regional Internet Registry
Internet Assigned Numbers Authority

7. What is the ARP Hardware type value for Ethernet?
Acknowledgements - checksums and timers
1
Redirect
Internet Assigned Numbers Authority

8. What is the format of the TCP Header Length field?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Length of header in words (32-bit)
Protocols that include subnet masks in their routing updates
6

9. What is prefix /27 in decimal notation?
64
Final
LIRs
255.255.255.224

10. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
IANA
Acknowledgement
255.255.255.248
Largest segment size that the sender is willing to accept

11. Enables debugging output for ARP transactions
Router#debug arp
127.0.0.0/8
Subtract Header Length field from Total Length field
Internet Control Message Protocol

12. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
4
Electrical/Optical - Mechanical - Functional and Procedural
ICANN
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

13. Why must the header checksum of an IPv4 packet be recalculated at every router?
IPv4 and IPv6
Each router decrements the TTL
Redirect
64

14. What are the steps to subnet an IPv4 address?
Router Advertisement
2
Application
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet

15. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
17
Router(config-if)#arp timeout {seconds}
Regional Internet Registry
Time to Live

16. What is the format of the DiffServ byte?
DSCP (6-bit); ECN (2-bit)
LIRs
8
Router(config-if)#no ip redirects

17. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
127.0.0.0/8
Electrical/Optical - Mechanical - Functional and Procedural
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
192.88.99.0/24

18. What is ICMP Type 8?
Sequence Number
Echo
Electrical/Optical - Mechanical - Functional and Procedural
Open Systems Interconnection

19. What is ICMP Type 5?
Redirect
Internet
Reset
169.254.0.0/16

20. What is OSI?
192.88.99.0/24
Open Systems Interconnection
Router(config-if)#arp timeout {seconds}
Congestion Window Reduced

21. What is the format of the Flags field in the TCP header?
More Fragments follow
RFC 3330
Subtract Header Length field from Total Length field
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

22. What is ISP?
Internet Service Provider
20 octets
64
17

23. What is the first octet rule for IPv4 address classes in binary?
255.255.255.128
Acknowledgements - checksums and timers
2
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

24. What is prefix /26 in decimal notation?
255.255.255.192
Network interface
Redirect
Windowing

25. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
IANA
Per-Hop Behaviour (PHB)
Loose source routing; Strict source routing; Record route; Timestamp
Version (4-bit); Header Length (4-bit); ToS (8-bit); Total Length (16-bit); Identifier (16-bit); Flags (3-bit); Fragment Offset (13-bit); TTL (8-bit); Protocol (8-bit); Header Checksum (16-bit); Source Address (32-bit); Destination Address (32-bit);

26. What is ICMP Type 3?
17
RIRs
Address Resolution Protocol
Destination Unreachable

27. What is RIR?
198.18.0.0/15
Internet Corporation for Assigned Network Numbers
Regional Internet Registry
Congestion Window Reduced

28. What are the protocol categories that describe the physical layer?
ICMP Router Discovery Protocol
255.255.255.252
Electrical/Optical - Mechanical - Functional and Procedural
RFC 1918

29. What is the IPv4 Protocol number of RSVP?
169.254.0.0/16
46
2
Router(config-if)#arp timeout {seconds}

30. What is the ARP Operation value for an Inverse ARP Request?
Each router decrements the TTL
8
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
ICMP Router Discovery Protocol

31. What is ICMP Type 9?
Router Advertisement
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Transmission Control Protocol
60 octets

32. What is the other name for the TCP Header Length field?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Hardware type (16-bit); Protocol type (16-bit); Hardware address length (8-bit); Protocol address length (8-bit); Operation (16-bit); Sender hardware address; Sender protocol address; Target hardware address; Target protocol address
Data Offset
Router(config-if)#arp timeout {seconds}

33. What is the prerequisite for using the Urgent Pointer field in the TCP header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
RIPv1 and IGRP
255.255.255.248
URG flag set

34. Who are LIRs?
20 octets
Mostly large ISPs - enterprises - or academic institutions
4
RIRs

35. What is the Fragment Offset field in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Application
0.0.0.0/8
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

36. What is the format of an ICMP header?
Open Systems Interconnection
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Router#show arp
Router#clear arp-cache [{interface {interface}} | {ip-address}]

37. What is the IPv4 Protocol number for IP in IP encapsulation?
Identifier; Flags and Fragmentation Offset
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding
4
RIPv1 and IGRP

38. What is prefix /29 in decimal notation?
Both the TCP header and the encapsulated data
RFC 791
Internet Protocol
255.255.255.248

39. Which RFC defines the private IPv4 address ranges?
1 Determine how many subnets are required; 2 Determine how many hosts per subnet are required; 3 Determine the subnet mask for each subnet; 4 Calculate the network address for each subnet
DSCP (6-bit); ECN (2-bit)
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
RFC 1918

40. What is the format of a TCP header?
Source Port (16-bit); Destination Port (16-bit); Sequence Number (32-bit); Acknowledgement Number (32-bit); Header Length (4-bit); Reserved (4-bit); Flags (8-bit); Windows Size (16-bit); Checksum (16-bit); Urgent Pointer (16-bit); Options; Padding
2
255.255.255.248
Mostly large ISPs - enterprises - or academic institutions

41. Which RFC defines the special use IPv4 address ranges?
Maximum Segment Size (MSS)
Each router decrements the TTL
Protocols that include subnet masks in their routing updates
RFC 3330

42. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
3
Router(config)#ip arp proxy disable
Internet
IANA

43. What is the purpose of a socket?
Used by IRDP on some operating systems to discover local routers
Application
Uniquely identify every application in the network
4

44. What is the recommended default TTL?
ECN-Echo
64
DSCP (6-bit); ECN (2-bit)
Internet Corporation for Assigned Network Numbers

45. What is the ARP Protocol type value for IPv4?
0x0800
Final
1
255.255.255.252

46. What is the ARP Hardware address length value for Ethernet?
6
DSCP (6-bit); ECN (2-bit)
Transmission Control Protocol
Network interface

47. What is the IPv4 Protocol number for OSPF?
20 octets
RFC 1918
89
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

48. Who assigns IP address space to its own customers?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
IANA
LIRs
Router Advertisement

49. What is the IPv4 protocol number for UDP?
The next sequence number that the source expects to receive from the destination
Router Selection
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
17

50. What are classless routing protocols?
192.0.2.0/24
Open Systems Interconnection
ECN-Echo
Protocols that include subnet masks in their routing updates