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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 TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router#clear arp-cache [{interface {interface}} | {ip-address}]
1
Internet

2. Disables proxy ARP on an interface
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);
Protocols that include subnet masks in their routing updates
Sequence Number
Router(config-if)#no ip proxy-arp

3. What is the purpose of a socket?
Internet Protocol
Router(config-if)#arp timeout {seconds}
Uniquely identify every application in the network
Per-Hop Behaviour (PHB)

4. Which RFC defines the private IPv4 address ranges?
IANA
An ARP request issued by a host with its own IPv4 address as the target address
Congestion Window Reduced
RFC 1918

5. Displays the ARP cache of a router
RFC 3330
Router#show arp
255.255.255.128
255.255.255.240

6. What is PSH?
Identifier; Flags and Fragmentation Offset
192.0.2.0/24
Push
All Internet Registries

7. What is ECE?
255.255.255.192
ECN-Echo
Protocols that don't include subnet masks in their routing updates
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

8. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Router(config)#ip arp proxy disable
Network interface
Echo
Uniquely identify every application in the network

9. What is prefix /27 in decimal notation?
255.255.255.224
Windowing
Router(config-if)#arp timeout {seconds}
Urgent

10. What is the minimum length of an IPv4 header?
IANA
All Internet Registries
Destination Unreachable
20 octets

11. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Router(config)#ip arp proxy disable
ICANN
The next sequence number that the source expects to receive from the destination
IANA

12. What is OSI?
Open Systems Interconnection
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
9
IANA

13. What are the protocol categories that describe the physical layer?
47
Echo Reply
Electrical/Optical - Mechanical - Functional and Procedural
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

14. Who group public IPv4 address space by major geographic region?
Router#debug arp
3
Destination Unreachable
ICANN and IANA

15. Who administers and registers IP address space and AS numbers within a region?
RIRs
Loose source routing; Strict source routing; Record route; Timestamp
Open Systems Interconnection
DSCP (6-bit); ECN (2-bit)

16. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Router#show arp
IANA
Application
255.255.255.248

17. What mechanism is used by TCP to regulate the flow of segments?
Internet Control Message Protocol
Windowing
Padding of zeros to ensure that the header ends on a 32-bit boundary
Push

18. What IPv4 header fields are used for fragmentation?
Synchronize
IANA
255.255.255.128
Identifier; Flags and Fragmentation Offset

19. What is ARP?
Router#show arp
20 octets
Address Resolution Protocol
4

20. What is the format of an IPv4 header?
0.0.0.0/8
127.0.0.0/8
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);
They are the same byte - but the names and value interpretations are different

21. What is ICMP?
Per-Hop Behaviour (PHB)
Echo
Internet Control Message Protocol
Regional Internet Registry

22. What is prefix /28 in decimal notation?
ECN-Echo
IPv4 and IPv6
255.255.255.240
9

23. What routing protocols are classful?
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Internet Service Provider
RIPv1 and IGRP
Both the TCP header and the encapsulated data

24. Who can assign IP address space to end user organizations?
RFC 1918
All Internet Registries
ECN-Echo
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

25. What is the ARP Protocol type value for IPv4?
47
255.255.255.224
Padding of zeros to ensure that the header ends on a 32-bit boundary
0x0800

26. What is prefix /25 in decimal notation?
255.255.255.224
255.255.255.248
The next sequence number that the source expects to receive from the destination
255.255.255.128

27. Disables proxy ARP on all interfaces
Internet
8
More Fragments follow
Router(config)#ip arp proxy disable

28. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
255.255.255.224
Acknowledgements - checksums and timers
Largest segment size that the sender is willing to accept
IANA

29. Who are LIRs?
46
Router#debug arp
Router(config-if)#arp timeout {seconds}
Mostly large ISPs - enterprises - or academic institutions

30. Disables the sending of ICMP redirect messages
ECN-Echo
Router(config-if)#no ip redirects
192.88.99.0/24
Both the TCP header and the encapsulated data

31. What is the format of an ARP packet?
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
Used by IRDP on some operating systems to discover local routers
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 791

32. What is IP?
Windowing
Network interface
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
Internet Protocol

33. What is the first octet rule for IPv4 address classes in decimal?
88
4
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

34. What is the difference between the ToS and the DiffServ byte?
Sequence Numbers
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
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
They are the same byte - but the names and value interpretations are different

35. Which RFC defines IPv4?
RFC 791
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Largest segment size that the sender is willing to accept
64

36. What is the ARP Hardware address length value for Ethernet?
0
0.0.0.0/8
Network interface
6

37. Which protocol has mostly replaced Reverse ARP?
DHCP
6
2
4

38. Who allocates public IP address ranges to NIRs or LIRs?
255.255.255.192
URG flag set
RIPv1 and IGRP
RIRs

39. Who allocates IP address space and AS numbers to RIRs?
17
Internet Service Provider
National Internet Registry
IANA

40. What is the the MF-bit in the IPv4 header?
Host-to-host
NIRs
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
More Fragments follow

41. Which RFC defines the special use IPv4 address ranges?
RFC 3330
IANA
Router(config)#arp {ip-address} {mac-address} arpa
URG flag set

42. Enables debugging output for ARP transactions
Internet Assigned Numbers Authority
Router#debug arp
Uniquely identify every application in the network
6

43. What is the DF-bit in the IPv4 header?

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44. What is NIR?
3
255.255.255.224
Push
National Internet Registry

45. What is the format of the ToS byte in the IPv4 header?
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
RFC 1918
Internet Corporation for Assigned Network Numbers
192.0.2.0/24

46. What is covered by the TCP Checksum field?
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
Both the TCP header and the encapsulated data
More Fragments follow
Used by a host to obtain the IP address associated with another host's MAC address

47. What are the most common IP version numbers?
IPv4 and IPv6
192.88.99.0/24
127.0.0.0/8
RIPv1 and IGRP

48. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Internet Service Provider
Each router decrements the TTL
1
IANA

49. Adds a permanent static ARP entry for an Ethernet host
6
Router(config)#arp {ip-address} {mac-address} arpa
8
Router Selection

50. What is TCP?
IANA
Transmission Control Protocol
Length of header in words (32-bit)
ICANN