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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 proxy ARP?
89
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Push
192.0.2.0/24

2. What are classful routing protocols?

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3. What is IRDP?
Used by a host to obtain the IP address associated with another host's MAC address
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Internet Service Provider
ICMP Router Discovery Protocol

4. What is the ARP Operation value for a Reverse ARP Reply?
RIPv1 and IGRP
4
Router(config-if)#no ip redirects
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

5. What is IANA?
1
Internet Service Provider
88
Internet Assigned Numbers Authority

6. What is RST?
255.255.255.240
Reset
Network interface
8

7. Which IPv4 address range is reserved for loopback testing?
127.0.0.0/8
169.254.0.0/16
IANA
Host-to-host

8. What is the format of an ICMP header?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
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
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
Largest segment size that the sender is willing to accept

9. What is added after the Option field in the TCP header?
Subtract Header Length field from Total Length field
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router Selection

10. What is Inverse ARP?

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11. Which IPv4 address range is reserved for self-identification on a local subnet?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Sequence Numbers
0.0.0.0/8
Internet Protocol

12. What is prefix /27 in decimal notation?
192.88.99.0/24
255.255.255.224
Used by IRDP on some operating systems to discover local routers
Sequence Number + Data payload octets + 1

13. What is prefix /25 in decimal notation?
255.255.255.128
DHCP
Congestion Window Reduced
Sequence Number + Data payload octets + 1

14. What is the format of the DiffServ byte?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Internet
4
DSCP (6-bit); ECN (2-bit)

15. What TCP/IP protocol suite layer corresponds to the transport layer of the OSI model?
RIPv1 and IGRP
Largest segment size that the sender is willing to accept
Host-to-host
Router Selection

16. Which RFC defines IPv4?
RFC 791
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Echo
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

17. Who group public IPv4 address space by major geographic region?
ICANN and IANA
Host-to-host
ICANN
0

18. What is the format of the ToS byte in the IPv4 header?
Acknowledgements - checksums and timers
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Host-to-host
198.18.0.0/15

19. What is the difference between the ToS and the DiffServ byte?
Largest segment size that the sender is willing to accept
They are the same byte - but the names and value interpretations are different
Router#clear arp-cache [{interface {interface}} | {ip-address}]
0

20. What are classless routing protocols?
2
Protocols that include subnet masks in their routing updates
Router(config-if)#no ip proxy-arp
Router(config)#arp {ip-address} {mac-address} arpa

21. What is IP?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Internet Protocol
Time to Live

22. Which protocol has mostly replaced Reverse ARP?
RFC 791
Subtract Header Length field from Total Length field
255.255.255.240
DHCP

23. What is the ARP Operation value for a Reverse ARP Request?
3
Time to Live
192.88.99.0/24
Internet Protocol

24. What is the IPv4 Protocol number for IP in IP encapsulation?
88
Mostly large ISPs - enterprises - or academic institutions
0x0800
4

25. What is the IPv4 Protocol number for ICMP?
Router#show arp
1
Both the TCP header and the encapsulated data
Network interface

26. What is the recommended default TTL?
64
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
255.255.255.224
47

27. What are the IP Precedence values?
Router#debug arp
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
255.255.255.252
2

28. What mechanism is used by TCP to regulate the flow of segments?
60 octets
198.18.0.0/15
Identifier; Flags and Fragmentation Offset
Windowing

29. What mechanisms are used by TCP to provide reliable segment delivery?
Router#show arp
9
8
Acknowledgements - checksums and timers

30. What is the first octet rule for IPv4 address classes in binary?
ICMP Router Discovery Protocol
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
0

31. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Sequence Number + Data payload octets + 1
Internet Service Provider
Each router decrements the TTL
Largest segment size that the sender is willing to accept

32. What is the format of a TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
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
60 octets
Used by a host to obtain the IP address associated with another host's MAC address

33. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Router Advertisement
Sequence Number + Data payload octets + 1
Reset

34. What is the ARP Operation value for an ARP Request?
Router Advertisement
4
An ARP request issued by a host with its own IPv4 address as the target address
1

35. What is the function of ICMP redirect messages?
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
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
0x0800
Router#clear arp-cache [{interface {interface}} | {ip-address}]

36. What is the format of the Flags field in the TCP header?
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)
Router(config-if)#no ip redirects
255.255.255.240
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts

37. What is OSI?
Internet Assigned Numbers Authority
Maximum Segment Size (MSS)
Internet Protocol
Open Systems Interconnection

38. Who allocates IP address space and AS numbers to RIRs?
20 octets
Acknowledgement
IANA
Echo

39. Who assigns IP address space to its own customers?
Echo Reply
Destination Unreachable
Maximum Segment Size (MSS)
LIRs

40. What mechanism is used by TCP to provided ordered segment delivery?
Sequence Numbers
Local Internet Registry
ICANN and IANA
169.254.0.0/16

41. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
1
Reset
ICANN

42. What is ISP?
RFC 3330
RIRs
Router(config-if)#arp timeout {seconds}
Internet Service Provider

43. Which IPv4 address range is reserved for use in documentation and example code?
Internet Corporation for Assigned Network Numbers
192.0.2.0/24
IANA
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application

44. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
IANA
National Internet Registry
Transmission Control Protocol
3

45. What is the IPv4 Protocol number for IGMP?
17
1
2
Largest segment size that the sender is willing to accept

46. What is the ARP Hardware type value for Ethernet?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
1
Router#clear arp-cache [{interface {interface}} | {ip-address}]
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

47. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Protocols that include subnet masks in their routing updates
Regional Internet Registry
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Network interface

48. What is ICMP Type 9?
255.255.255.240
Router Advertisement
Internet Protocol
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

49. What is the format of a UDP header?
Windowing
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
0x0800
Identifier; Flags and Fragmentation Offset

50. Specifies the format in which subnet masks are displayed in show command output
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
64
89