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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 allocates public IP address ranges to NIRs or LIRs?
Address Resolution Protocol
6
Router Advertisement
RIRs

2. What is ICMP Type 10?
47
6
Router Selection
Application

3. Deletes dynamic entries from the ARP cache
169.254.0.0/16
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
4
Router#clear arp-cache [{interface {interface}} | {ip-address}]

4. 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
Congestion Window Reduced
More Fragments follow
Internet Assigned Numbers Authority

5. Which RFC defines the special use IPv4 address ranges?
4
RFC 3330
RFC 1918
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

6. What is ISP?
Local Internet Registry
Congestion Window Reduced
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Internet Service Provider

7. What is prefix /27 in decimal notation?
88
6
255.255.255.224
LIRs

8. What is the ARP Hardware address length value for Ethernet?
Internet Corporation for Assigned Network Numbers
47
6
Electrical/Optical - Mechanical - Functional and Procedural

9. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
IANA
Electrical/Optical - Mechanical - Functional and Procedural
Internet
Mostly large ISPs - enterprises - or academic institutions

10. What is added after the Option field in the TCP header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Uniquely identify every application in the network
1
Application

11. What is the recommended default TTL?
Internet Control Message Protocol
64
Local Internet Registry
Sequence Numbers

12. What is ECE?
ECN-Echo
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
255.255.255.240
Synchronize

13. What mechanisms are used by TCP to provide reliable segment delivery?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Acknowledgements - checksums and timers
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

14. What is the format of the Flags field in the IPv4 header?
Reserved (1-bit); DF (1-bit); MF (1-bit)
0x0800
Largest segment size that the sender is willing to accept
RIPv1 and IGRP

15. What is IANA?
Transmission Control Protocol
Internet Assigned Numbers Authority
Router Selection
Time Exceeded

16. Disables proxy ARP on an interface
DSCP (6-bit); ECN (2-bit)
Router(config-if)#no ip proxy-arp
Length of header in words (32-bit)
Echo

17. Which IPv4 address range is reserved for loopback testing?
Protocols that don't include subnet masks in their routing updates
Final
127.0.0.0/8
Padding of zeros to ensure that the header ends on a 32-bit boundary

18. What is a TCP Acknowledgement Number?
IANA
RIRs
The next sequence number that the source expects to receive from the destination
Destination Unreachable

19. What is ICMP Type 0?
255.255.255.248
Echo Reply
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
47

20. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Redirect
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (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
Network interface

21. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
RIRs
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
Router Selection

22. What is a TCP port number of an application called when it is coupled with the IP address of the server?
Address Resolution Protocol
Socket
They are the same byte - but the names and value interpretations are different
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

23. What is the value of the TCP Reserved field?
Padding of zeros to ensure that the header ends on a 32-bit boundary
0
255.255.255.248
Protocols that include subnet masks in their routing updates

24. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Reset
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Internet Control Message Protocol
Sequence Number + Data payload octets + 1

25. Which IPv4 address range is reserved for benchmark testing of Internet devices (RFC 2544)?
Router(config-if)#no ip proxy-arp
DHCP
Used by a host to obtain the IPv4 address associated with its own MAC address
198.18.0.0/15

26. What is the format of an ICMP header?
Final
Application
LIRs
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields

27. What is the ARP Operation value for a Reverse ARP Request?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Windowing
Sequence Number + Data payload octets + 1
3

28. What is gratuitous ARP?
Protocols that don't include subnet masks in their routing updates
Urgent
An ARP request issued by a host with its own IPv4 address as the target address
IANA

29. Which RFC defines IPv4?
1
Sequence Numbers
An ARP request issued by a host with its own IPv4 address as the target address
RFC 791

30. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
20 octets
Synchronize
Subtract Header Length field from Total Length field
They are the same byte - but the names and value interpretations are different

31. What is the purpose of a socket?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Length of header in words (32-bit)
Electrical/Optical - Mechanical - Functional and Procedural
Uniquely identify every application in the network

32. What is ICMP Type 11?
Time Exceeded
Urgent
Sequence Numbers
Internet Assigned Numbers Authority

33. What is the format of a TCP header?
The next sequence number that the source expects to receive from the destination
Identifier; Flags and Fragmentation Offset
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

34. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
255.255.255.224
Loose source routing; Strict source routing; Record route; Timestamp
Identifier; Flags and Fragmentation Offset
Application

35. What are the IP Precedence values?
8
Identifier; Flags and Fragmentation Offset
Used by a host to obtain the IPv4 address associated with its own MAC address
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

36. What are the protocol categories that describe the physical layer?
Electrical/Optical - Mechanical - Functional and Procedural
6
Router Advertisement
Address Resolution Protocol

37. What is the IPv4 Protocol number for ICMP?
RIRs
1
DSCP (6-bit); ECN (2-bit)
Acknowledgements - checksums and timers

38. What is the other name for the TCP Header Length field?
Network interface
Data Offset
RIRs
National Internet Registry

39. What is IRDP?
The next sequence number that the source expects to receive from the destination
RFC 1918
RIRs
ICMP Router Discovery Protocol

40. What is prefix /25 in decimal notation?
Sequence Number + Data payload octets + 1
255.255.255.128
169.254.0.0/16
127.0.0.0/8

41. What is ICMP Type 3?
RFC 791
Destination Unreachable
Address Resolution Protocol
Used by a host to obtain the IP address associated with another host's MAC address

42. What is OSI?
Don't Fragment
Open Systems Interconnection
Network interface
198.18.0.0/15

43. What is the IPv4 Protocol number for EIGRP?
3
88
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
127.0.0.0/8

44. What are the private IPv4 address ranges?
Router Advertisement
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Push
Sequence Number

45. What is ICMP Type 8?
Echo
Router#debug arp
Socket
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)

46. Which protocol has mostly replaced Reverse ARP?
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
Reserved (1-bit); DF (1-bit); MF (1-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
DHCP

47. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
Router(config-if)#no ip proxy-arp
Maximum Segment Size (MSS)
198.18.0.0/15
Largest segment size that the sender is willing to accept

48. What is IP?
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Internet Protocol
Open Systems Interconnection
255.255.255.128

49. Who can assign IP address space to end user organizations?
Internet Assigned Numbers Authority
ECN-Echo
All Internet Registries
Urgent

50. What is the function of ICMP redirect messages?
An ARP request issued by a host with its own IPv4 address as the target address
0x0800
LIRs
Used by routers to notify hosts of another router on the data link that should be used for a particular destination

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IPV4 Addressing

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