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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 ISP?
Used by a host to obtain the IP address associated with another host's MAC address
IANA
Internet Service Provider
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

2. What is the IPv4 Protocol number of RSVP?
127.0.0.0/8
192.0.2.0/24
46
Sequence Numbers

3. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
4
Network interface
Host-to-host
Internet Assigned Numbers Authority

4. What routing protocols are classful?
RIPv1 and IGRP
8
4
Per-Hop Behaviour (PHB)

5. What is NIR?
Local Internet Registry
National Internet Registry
Internet Assigned Numbers Authority
255.255.255.224

6. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Largest segment size that the sender is willing to accept
255.255.255.224
Synchronize
192.0.2.0/24

7. What is ECE?
ECN-Echo
Windowing
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Padding of zeros to ensure that the header ends on a 32-bit boundary

8. What is the ARP Operation value for an Inverse ARP Request?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
8
Per-Hop Behaviour (PHB)
Reserved (1-bit); DF (1-bit); MF (1-bit)

9. Which RFC defines the special use IPv4 address ranges?
RFC 3330
0x0800
20 octets
17

10. What are the uses of gratuitous ARP?
Acknowledgement
Congestion Window Reduced
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
RIPv1 and IGRP

11. What is ICMP?
Router(config)#arp {ip-address} {mac-address} arpa
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
DSCP (6-bit); ECN (2-bit)
Internet Control Message Protocol

12. What is the IPv4 Protocol number for ICMP?
Per-Hop Behaviour (PHB)
An ARP request issued by a host with its own IPv4 address as the target address
Transmission Control Protocol
1

13. What is OSI?
0
Open Systems Interconnection
Reserved (1-bit); DF (1-bit); MF (1-bit)
RFC 1918

14. Who allocates IP address space and AS numbers to RIRs?
IANA
4
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
National Internet Registry

15. What is URG?
NIRs
3
Urgent
255.255.255.192

16. What is prefix /28 in decimal notation?
255.255.255.252
255.255.255.240
4
169.254.0.0/16

17. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Internet
Internet Assigned Numbers Authority
Host-to-host
198.18.0.0/15

18. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
198.18.0.0/15
Data Offset
Internet
88

19. Disables the sending of ICMP redirect messages
DSCP (6-bit); ECN (2-bit)
127.0.0.0/8
1
Router(config-if)#no ip redirects

20. What is ICMP Type 9?
Largest segment size that the sender is willing to accept
Router Advertisement
192.0.2.0/24
Both the TCP header and the encapsulated data

21. Who are LIRs?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Mostly large ISPs - enterprises - or academic institutions
Router#show arp
Local Internet Registry

22. What is the ARP Operation value for an Inverse ARP Reply?
9
47
Uniquely identify every application in the network
Urgent

23. What is ARP?
Router(config-if)#no ip redirects
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
Reset
Address Resolution Protocol

24. What is the IPv4 Protocol number for GRE?
47
Router(config-if)#arp timeout {seconds}
ICANN
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

25. What is the content of the TCP Window Size field?
0
4
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
Echo

26. What is the the MF-bit in the IPv4 header?
More Fragments follow
Used by IRDP on some operating systems to discover local routers
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
60 octets

27. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
Electrical/Optical - Mechanical - Functional and Procedural
Router(config)#arp {ip-address} {mac-address} arpa
Both the TCP header and the encapsulated data

28. What is prefix /29 in decimal notation?
89
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.248
Acknowledgement

29. What is ICMP Type 11?
IANA
Push
Internet Corporation for Assigned Network Numbers
Time Exceeded

30. Adds a permanent static ARP entry for an Ethernet host
2
Router(config)#arp {ip-address} {mac-address} arpa
DHCP
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)

31. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
RIPv1 and IGRP
Per-Hop Behaviour (PHB)
255.255.255.128

32. What are classful routing protocols?

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33. What is the maximum length of an IPv4 header?
Internet Control Message Protocol
Subtract Header Length field from Total Length field
60 octets
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

34. What is the format of an IPv4 header?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
2
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
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);

35. What is proxy ARP?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Per-Hop Behaviour (PHB)
255.255.255.128
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

36. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
An ARP request issued by a host with its own IPv4 address as the target address
192.88.99.0/24
Urgent
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment

37. What is LIR?
Local Internet Registry
6
Time Exceeded
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

38. What is the format of a TCP header?
More Fragments follow
IANA
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
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

39. What is the first octet rule for IPv4 address classes in binary?
Local Internet Registry
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Per-Hop Behaviour (PHB)
4

40. What is the format of a UDP header?
1
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Host-to-host
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

41. What is the ARP Protocol type value for IPv4?
NIRs
89
Used by a host to obtain the IPv4 address associated with its own MAC address
0x0800

42. Disables proxy ARP on all interfaces
Used by a host to obtain the IP address associated with another host's MAC address
Router(config)#ip arp proxy disable
Internet Service Provider
Subtract Header Length field from Total Length field

43. What are the most common IP version numbers?
Router(config-if)#no ip redirects
IPv4 and IPv6
20 octets
46

44. What is PSH?
RFC 1918
Don't Fragment
Push
NIRs

45. What is the format of the ToS byte in the IPv4 header?
IANA
2
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Loose source routing; Strict source routing; Record route; Timestamp

46. Who can assign IP address space to end user organizations?
All Internet Registries
RIRs
Internet Service Provider
2

47. Which RFC defines the private IPv4 address ranges?
RFC 1918
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Internet Service Provider
ECN-Echo

48. What is ICANN?
Application
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Used by a host to obtain the IPv4 address associated with its own MAC address
Internet Corporation for Assigned Network Numbers

49. What is the IPv4 Protocol number for IGMP?
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
Router(config)#ip arp proxy disable
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

50. What is ACK?
Acknowledgement
46
Don't Fragment
3