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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.
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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. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
Per-Hop Behaviour (PHB)
Synchronize
Maximum Segment Size (MSS)

2. What is PSH?
Used by IRDP on some operating systems to discover local routers
Push
255.255.255.252
Time Exceeded

3. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Internet Service Provider
Router#debug arp
Network interface

4. What is ARP?
Socket
255.255.255.248
Time to Live
Address Resolution Protocol

5. What is the format of the ToS byte in the IPv4 header?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
DSCP (6-bit); ECN (2-bit)
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router(config)#arp {ip-address} {mac-address} arpa

6. What is prefix /26 in decimal notation?
Sequence Number + Data payload octets + 1
Urgent
Acknowledgement
255.255.255.192

7. What is the IPv4 Protocol number for IGMP?
Internet
They are the same byte - but the names and value interpretations are different
2
Mostly large ISPs - enterprises - or academic institutions

8. Who allocates IP address space and AS numbers to RIRs?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
IANA
Router Advertisement
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

9. What is the ARP Hardware type value for Ethernet?
8
169.254.0.0/16
1
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

10. What are the private IPv4 address ranges?
Maximum Segment Size (MSS)
20 octets
RIPv1 and IGRP
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16

11. What is prefix /27 in decimal notation?
255.255.255.224
0x0800
60 octets
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

12. What is prefix /25 in decimal notation?
1
64
255.255.255.128
169.254.0.0/16

13. What is the content of the TCP Window Size field?
0x0800
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
RIRs
Router Advertisement

14. What is the function of ICMP router advertisement and router selection messages?
127.0.0.0/8
89
Used by IRDP on some operating systems to discover local routers
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

15. What is Reverse ARP?
Used by a host to obtain the IPv4 address associated with its own MAC address
NIRs
Internet Assigned Numbers Authority
Host-to-host

16. What is prefix /30 in decimal notation?
An ARP request issued by a host with its own IPv4 address as the target address
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Sequence Numbers
255.255.255.252

17. What is the maximum length of an IPv4 header?
192.0.2.0/24
RIRs
255.255.255.248
60 octets

18. Enables debugging output for ARP transactions
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);
Uniquely identify every application in the network
Router#debug arp
Destination Unreachable

19. What is a TCP port number of an application called when it is coupled with the IP address of the server?
255.255.255.224
Socket
0
RFC 3330

20. Why must the header checksum of an IPv4 packet be recalculated at every router?
Each router decrements the TTL
Don't Fragment
Protocols that include subnet masks in their routing updates
Internet Service Provider

21. What is the ARP Operation value for an Inverse ARP Reply?
1
60 octets
9
Don't Fragment

22. What routing protocols are classful?
Destination Unreachable
Mostly large ISPs - enterprises - or academic institutions
RIPv1 and IGRP
Synchronize

23. What is gratuitous ARP?
Urgent
Internet Protocol
An ARP request issued by a host with its own IPv4 address as the target address
NIRs

24. What is covered by the TCP Checksum field?
Largest segment size that the sender is willing to accept
2
Both the TCP header and the encapsulated data
Protocols that don't include subnet masks in their routing updates

25. Disables the sending of ICMP redirect messages
Router(config-if)#no ip redirects
Padding of zeros to ensure that the header ends on a 32-bit boundary
Internet Control Message Protocol
255.255.255.240

26. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
Both the TCP header and the encapsulated data
192.88.99.0/24
Internet
Length of header in words (32-bit)

27. What is IRDP?
2
ICMP Router Discovery Protocol
Push
Internet Assigned Numbers Authority

28. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
127.0.0.0/8
255.255.255.252
Address Resolution Protocol

29. What is a TCP Acknowledgement Number?
The next sequence number that the source expects to receive from the destination
Both the TCP header and the encapsulated data
RFC 1918
Router(config-if)#no ip proxy-arp

30. What is IP?
Router(config)#arp {ip-address} {mac-address} arpa
ICMP Router Discovery Protocol
Internet Protocol
0x0800

31. What is the ARP Protocol address length value for IPv4?
RFC 791
Urgent
Router#debug arp
4

32. Which RFC defines the special use IPv4 address ranges?
RFC 3330
255.255.255.224
IPv4 and IPv6
Router Advertisement

33. What is prefix /28 in decimal notation?
Protocols that include subnet masks in their routing updates
RFC 1918
255.255.255.240
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

34. What is the value of the TCP Reserved field?
255.255.255.192
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
0
0x0800

35. What are classless routing protocols?
Protocols that include subnet masks in their routing updates
Largest segment size that the sender is willing to accept
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Echo

36. What is the IPv4 Protocol number for ICMP?
1
Reserved (1-bit); DF (1-bit); MF (1-bit)
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Used by a host to obtain the IPv4 address associated with its own MAC address

37. What is proxy ARP?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
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
0.0.0.0/8

38. What are the protocol categories that describe the physical layer?
0.0.0.0/8
192.88.99.0/24
Electrical/Optical - Mechanical - Functional and Procedural
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

39. What is SYN?
Synchronize
46
Push
255.255.255.252

40. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
47
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
IANA

41. What is URG?
RIRs
IANA
Urgent
Internet Control Message Protocol

42. What is the format of the TCP Header Length field?
IANA
Per-Hop Behaviour (PHB)
Router(config-if)#no ip redirects
Length of header in words (32-bit)

43. Who administers and registers IP address space and AS numbers within a region?
Reset
Application
RIRs
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

44. What is the format of the Flags field in the TCP header?
Identifier; Flags and Fragmentation Offset
89
Time Exceeded
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

45. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
89
Largest segment size that the sender is willing to accept
ICANN
The next sequence number that the source expects to receive from the destination

46. What are the most common IP version numbers?
Echo Reply
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
88
IPv4 and IPv6

47. What is the IPv4 Protocol number for EIGRP?
Internet
88
ICMP Router Discovery Protocol
Acknowledgements - checksums and timers

48. What is the ARP Operation value for a Reverse ARP Request?
3
Data Offset
They are the same byte - but the names and value interpretations are different
Internet Corporation for Assigned Network Numbers

49. What is NIR?
Uniquely identify every application in the network
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
National Internet Registry
192.0.2.0/24

50. What are classful routing protocols?

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