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IPV4 Addressing

Subject : it-skills

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Answer 50 questions in 15 minutes.
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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. What is the function of ICMP router advertisement and router selection messages?
URG flag set
Router(config-if)#arp timeout {seconds}
Internet Corporation for Assigned Network Numbers
Used by IRDP on some operating systems to discover local routers

2. Who are LIRs?
8
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Mostly large ISPs - enterprises - or academic institutions
Acknowledgements - checksums and timers

3. What is ARP?
47
Final
Address Resolution Protocol
Congestion Window Reduced

4. Which RFC defines the private IPv4 address ranges?
0
RFC 1918
89
DHCP

5. What is the ARP Hardware address length value for Ethernet?
6
Time to Live
ICMP Router Discovery Protocol
198.18.0.0/15

6. What is the ARP Operation value for a Reverse ARP Request?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
3
IANA
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

7. What is the the MF-bit in the IPv4 header?
More Fragments follow
1
Internet
Router#debug arp

8. What is the IPv4 Protocol number for TCP?
6
17
255.255.255.128
255.255.255.192

9. Who administers and registers IP address space and AS numbers within a region?
RIRs
Largest segment size that the sender is willing to accept
Router Selection
47

10. What is the content of the TCP Window Size field?
Address Resolution Protocol
1
8
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

11. What is CWR?
ICANN
9
Congestion Window Reduced
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)

12. What is IRDP?
ICMP Router Discovery Protocol
Identifier; Flags and Fragmentation Offset
Router(config-if)#no ip proxy-arp
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

13. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
The next sequence number that the source expects to receive from the destination
IANA
ECN-Echo

14. What is gratuitous ARP?
Reset
An ARP request issued by a host with its own IPv4 address as the target address
6
Protocols that don't include subnet masks in their routing updates

15. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
255.255.255.252
Echo
All Internet Registries
Subtract Header Length field from Total Length field

16. What is prefix /25 in decimal notation?
Urgent
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
255.255.255.128
3

17. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
Router(config)#arp {ip-address} {mac-address} arpa
Sequence Number
IANA
ICANN

18. Who can assign IP address space to end user organizations?
255.255.255.192
Reset
National Internet Registry
All Internet Registries

19. What is ECE?
DHCP
ECN-Echo
Loose source routing; Strict source routing; Record route; Timestamp
URG flag set

20. What are the most frequently used options in the IPv4 header?
Urgent
An ARP request issued by a host with its own IPv4 address as the target address
Loose source routing; Strict source routing; Record route; Timestamp
Acknowledgements - checksums and timers

21. What is the minimum length of an IPv4 header?
An ARP request issued by a host with its own IPv4 address as the target address
Subtract Header Length field from Total Length field
20 octets
LIRs

22. What are the IP Precedence values?
192.0.2.0/24
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Data Offset
60 octets

23. What is the ARP Operation value for an ARP Reply?
Router Advertisement
Padding of zeros to ensure that the header ends on a 32-bit boundary
2
60 octets

24. What is the first octet rule for IPv4 address classes in decimal?
Router Selection
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

25. Displays the ARP cache of a router
ICANN and IANA
Protocols that don't include subnet masks in their routing updates
Router#show arp
Time to Live

26. What is prefix /28 in decimal notation?
Router Selection
Loose source routing; Strict source routing; Record route; Timestamp
255.255.255.240
Mostly large ISPs - enterprises - or academic institutions

27. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
ICMP Router Discovery Protocol
Synchronize
IANA
Transmission Control Protocol

28. What is the format of a TCP header?
IANA
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
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

29. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
Redirect
IANA
Synchronize

30. What is prefix /26 in decimal notation?
ICANN
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
255.255.255.192

31. What is the content of the Maximum Segment Size (MSS) in the Option field of the TCP header?
0x0800
Largest segment size that the sender is willing to accept
NIRs
Internet Assigned Numbers Authority

32. What is the first octet rule for IPv4 address classes in binary?
192.0.2.0/24
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Padding of zeros to ensure that the header ends on a 32-bit boundary

33. What is the format of the TCP Header Length field?
They are the same byte - but the names and value interpretations are different
Padding of zeros to ensure that the header ends on a 32-bit boundary
Length of header in words (32-bit)
Time to Live

34. What is the content of the the Urgent Pointer field in the TCP header?
0x0800
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
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Uniquely identify every application in the network

35. Disables proxy ARP on all interfaces
Uniquely identify every application in the network
Router(config)#ip arp proxy disable
ICANN and IANA
Socket

36. What is IANA?
Internet Assigned Numbers Authority
Redirect
Reset
Internet Protocol

37. Which protocol has mostly replaced Reverse ARP?
Data Offset
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
DHCP
IANA

38. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Application
Length of header in words (32-bit)
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Reserved (1-bit); DF (1-bit); MF (1-bit)

39. Who allocates public IP address ranges to NIRs or LIRs?
RIRs
255.255.255.252
3
1

40. What TCP/IP protocol suite layer corresponds to the physical and data link layers of the OSI model?
Acknowledgements - checksums and timers
Network interface
Host-to-host
1

41. What is the format of the Flags field in the IPv4 header?
Used by IRDP on some operating systems to discover local routers
ECN-Echo
Both the TCP header and the encapsulated data
Reserved (1-bit); DF (1-bit); MF (1-bit)

42. What is IP?
Internet Protocol
Host-to-host
IANA
Each router decrements the TTL

43. What is the ARP Operation value for an Inverse ARP Reply?
Protocols that include subnet masks in their routing updates
9
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

44. What is added after the option field in the IPv4 header?
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
198.18.0.0/15
Padding of zeros to ensure that the header ends on a 32-bit boundary
0.0.0.0/8

45. What is ICMP Type 9?
Router Advertisement
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Protocols that include subnet masks in their routing updates
Mostly large ISPs - enterprises - or academic institutions

46. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Router Advertisement
Internet Corporation for Assigned Network Numbers
47

47. What is the IPv4 Protocol number for ICMP?
2
Regional Internet Registry
Router Selection
1

48. What mechanism is used by TCP to provided ordered segment delivery?
1
0
Sequence Numbers
Push

49. What is OSI?
89
Open Systems Interconnection
Router(config-if)#no ip proxy-arp
RFC 3330

50. What are the most common IP version numbers?
ECN-Echo
IPv4 and IPv6
4
46

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IPV4 Addressing

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