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IPV4 Addressing

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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 ICMP Type 3?
Internet
17
Application
Destination Unreachable

2. What is RST?
Reset
NIRs
Mostly large ISPs - enterprises - or academic institutions
RFC 1918

3. Who allocates public IP address ranges to NIRs or LIRs?
1
192.0.2.0/24
Congestion Window Reduced
RIRs

4. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
47
89
Echo

5. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Acknowledgements - checksums and timers
IANA
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

6. What is the ARP Operation value for an Inverse ARP Reply?
Router Selection
9
RIRs
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

7. What is RIR?
Regional Internet Registry
Identifier; Flags and Fragmentation Offset
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

8. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
IPv4 and IPv6
An ARP request issued by a host with its own IPv4 address as the target address

9. Disables the sending of ICMP redirect messages
Router Selection
IANA
Router(config-if)#no ip redirects
Local Internet Registry

10. What routing protocols are classful?
RFC 1918
LIRs
RIPv1 and IGRP
3

11. What is SYN?
More Fragments follow
Synchronize
Reserved (1-bit); DF (1-bit); MF (1-bit)
1

12. Which RFC defines the private IPv4 address ranges?
Redirect
RFC 1918
0x0800
IANA

13. What is added after the option field in the IPv4 header?
Internet Protocol
Electrical/Optical - Mechanical - Functional and Procedural
Padding of zeros to ensure that the header ends on a 32-bit boundary
6

14. What is the ARP Protocol type value for IPv4?
URG flag set
89
0.0.0.0/8
0x0800

15. What is proxy ARP?
Router(config)#arp {ip-address} {mac-address} arpa
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
0.0.0.0/8

16. What are the most common IP version numbers?
89
ICANN and IANA
IPv4 and IPv6
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

17. What is the IPv4 Protocol number of RSVP?
1
17
46
9

18. What is the IPv4 Protocol number for OSPF?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
198.18.0.0/15
Loose source routing; Strict source routing; Record route; Timestamp
89

19. What are classful routing protocols?

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20. What is NIR?
They are the same byte - but the names and value interpretations are different
National Internet Registry
IANA
Length of header in words (32-bit)

21. What is the format of an ARP packet?
RIRs
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
Host-to-host
Synchronize

22. What are the most frequently used options in the IPv4 header?
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
Loose source routing; Strict source routing; Record route; Timestamp
255.255.255.240
Time to Live

23. What is the recommended default TTL?
Local Internet Registry
64
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Transmission Control Protocol

24. What is the format of the ToS byte in the IPv4 header?
Internet Assigned Numbers Authority
RFC 791
They are the same byte - but the names and value interpretations are different
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

25. What is ICANN?
Redirect
Internet Corporation for Assigned Network Numbers
DSCP (6-bit); ECN (2-bit)
4

26. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Congestion Window Reduced
Time to Live
Router(config-if)#no ip redirects

27. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Internet Protocol
Network interface
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Echo

28. Which RFC defines the special use IPv4 address ranges?
Used by IRDP on some operating systems to discover local routers
Reset
RFC 3330
0.0.0.0/8

29. Who can assign IP address space to end user organizations?
All Internet Registries
192.0.2.0/24
Echo
NIRs

30. What is ICMP Type 11?
46
Per-Hop Behaviour (PHB)
Largest segment size that the sender is willing to accept
Time Exceeded

31. What is OSI?
Padding of zeros to ensure that the header ends on a 32-bit boundary
URG flag set
Open Systems Interconnection
Regional Internet Registry

32. What is the IPv4 Protocol number for EIGRP?
Congestion Window Reduced
9
Don't Fragment
88

33. Adds a permanent static ARP entry for an Ethernet host
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Router(config)#arp {ip-address} {mac-address} arpa
Largest segment size that the sender is willing to accept
Time Exceeded

34. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
2
Destination Unreachable
Router(config-if)#no ip proxy-arp

35. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Both the TCP header and the encapsulated data
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Largest segment size that the sender is willing to accept
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

36. What is the Fragment Offset field in the IPv4 header?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Internet Service Provider
Regional Internet Registry
Padding of zeros to ensure that the header ends on a 32-bit boundary

37. What is the IPv4 Protocol number for IP in IP encapsulation?
Transmission Control Protocol
3
4
198.18.0.0/15

38. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Padding of zeros to ensure that the header ends on a 32-bit boundary
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Open Systems Interconnection

39. What is ICMP Type 0?
255.255.255.248
Router Advertisement
Echo Reply
RIRs

40. Who are LIRs?
17
Mostly large ISPs - enterprises - or academic institutions
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);
Internet Corporation for Assigned Network Numbers

41. What is ICMP Type 5?
Redirect
Used by IRDP on some operating systems to discover local routers
Acknowledgements - checksums and timers
Uniquely identify every application in the network

42. What is the content of the TCP Window Size field?
192.0.2.0/24
8
Internet Assigned Numbers Authority
Number of octets - starting with the octet indicated by the Acknowledgement Number - that the receiver will accept from the sender before the sender must stop transmitting and wait for a new Acknowledgement

43. What is ICMP Type 8?
20 octets
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
88
Echo

44. What is the IPv4 Protocol number for GRE?
Local Internet Registry
47
Acknowledgements - checksums and timers
Redirect

45. What is FIN?
Sequence Number
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Final
Internet Protocol

46. Which IPv4 address range is reserved for use in documentation and example code?
Router(config-if)#arp timeout {seconds}
Used by a host to obtain the IPv4 address associated with its own MAC address
Identifier; Flags and Fragmentation Offset
192.0.2.0/24

47. What is the ARP Hardware address length value for Ethernet?
RIPv1 and IGRP
Mostly large ISPs - enterprises - or academic institutions
255.255.255.240
6

48. What is the ARP Protocol address length value for IPv4?
All Internet Registries
255.255.255.240
4
Maximum Segment Size (MSS)

49. What mechanism is used by TCP to provided ordered segment delivery?
198.18.0.0/15
4
Sequence Numbers
RFC 3330

50. What is TCP?
Transmission Control Protocol
ECN-Echo
6
Echo Reply