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IPV4 Addressing

Subject : it-skills

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What is ECE?
ECN-Echo
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Regional Internet Registry
LIRs

2. What is the IPv4 protocol number for UDP?
17
ICANN
Internet Service Provider
Router(config)#ip arp proxy disable

3. What is the formula to calculate the next Sequence Number based on the Sequence Number of the current TCP segment?
Transmission Control Protocol
255.255.255.224
Sequence Number + Data payload octets + 1
Synchronize

4. Specifies the format in which subnet masks are displayed in show command output
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
255.255.255.128
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Protocols that don't include subnet masks in their routing updates

5. What is the format of the Flags field in the IPv4 header?
47
Open Systems Interconnection
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Reserved (1-bit); DF (1-bit); MF (1-bit)

6. What is the IPv4 Protocol number for EIGRP?
192.88.99.0/24
88
Used by a host to obtain the IPv4 address associated with its own MAC address
255.255.255.252

7. Who are LIRs?
64
Mostly large ISPs - enterprises - or academic institutions
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
RIPv1 and IGRP

8. What is the content of the the Urgent Pointer field in the TCP header?
8
9
Router#show arp
Number of octets to be added to the Sequence Number to indicate the end of the urgent data

9. What is the maximum length of an IPv4 header?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Reset
60 octets
Maximum Segment Size (MSS)

10. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
89
0.0.0.0/8
0
Subtract Header Length field from Total Length field

11. What is RST?
Don't Fragment
2
Reset
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111

12. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
2
Internet Service Provider

13. Disables the sending of ICMP redirect messages
Socket
Router(config-if)#no ip redirects
Internet Control Message Protocol
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

14. Who administers and registers IP address space and AS numbers within a region?
RIRs
Router(config-if)#no ip proxy-arp
Internet Control Message Protocol
Application

15. What is FIN?
Sequence Numbers
255.255.255.252
Final
Regional Internet Registry

16. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
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);
Router(config-if)#arp timeout {seconds}
255.255.255.248
192.88.99.0/24

17. What is ICMP Type 11?
60 octets
All Internet Registries
Time Exceeded
127.0.0.0/8

18. What is the other name for the TCP Header Length field?
Data Offset
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
Internet
Router(config-if)#arp timeout {seconds}

19. What mechanisms are used by TCP to provide reliable segment delivery?
255.255.255.248
Windowing
Acknowledgements - checksums and timers
Identifier; Flags and Fragmentation Offset

20. What are the uses of gratuitous ARP?
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
IPv4 and IPv6
Duplicate address checks; Advertise new data-link identifiers; Update the ARP caches of hosts
46

21. What is ICMP Type 8?
255.255.255.240
6
Echo
9

22. Who allocates IP address space and AS numbers to RIRs?
Padding of zeros to ensure that the header ends on a 32-bit boundary
IANA
LIRs
Sequence Number

23. What is OSI?
46
Open Systems Interconnection
1
Used by a host to obtain the IPv4 address associated with its own MAC address

24. What is added after the option field in the IPv4 header?
RIPv1 and IGRP
Router#show arp
47
Padding of zeros to ensure that the header ends on a 32-bit boundary

25. What is the ARP Operation value for an Inverse ARP Reply?
Router#debug arp
Per-Hop Behaviour (PHB)
IANA
9

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

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27. What is the format of a TCP header?
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
Reserved (1-bit); DF (1-bit); MF (1-bit)
Redirect
ECN-Echo

28. What is the recommended default TTL?
64
ECN-Echo
Push
RIPv1 and IGRP

29. What is the name of the queuing and forwarding of IP packets based on DiffServ?
Internet Corporation for Assigned Network Numbers
Per-Hop Behaviour (PHB)
127.0.0.0/8
More Fragments follow

30. What are the steps to subnet an IPv4 address?
Router#show arp
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
Maximum Segment Size (MSS)
IANA

31. Who is responsible for the global coordination of the DNS Root - IP addressing - and other Internet protocol resources?
Protocols that don't include subnet masks in their routing updates
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
IANA
Identifier; Flags and Fragmentation Offset

32. What is the ARP Operation value for a Reverse ARP Request?
60 octets
3
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
More Fragments follow

33. What is the format of a UDP header?
9
Padding of zeros to ensure that the header ends on a 32-bit boundary
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router#debug arp

34. What is the first octet rule for IPv4 address classes in decimal?
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
88
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
255.255.255.240

35. Which RFC defines IPv4?
Socket
National Internet Registry
RFC 791
An ARP request issued by a host with its own IPv4 address as the target address

36. What is the TTL field in the IPv4 header?
RIPv1 and IGRP
Time to Live
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
RFC 3330

37. What is LIR?
An ARP request issued by a host with its own IPv4 address as the target address
DSCP (6-bit); ECN (2-bit)
Local Internet Registry
Address Resolution Protocol

38. What is the format of the ToS field?
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
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
ECN-Echo

39. Disables proxy ARP on all interfaces
Router(config)#ip arp proxy disable
DHCP
2
All Internet Registries

40. What is covered by the TCP Checksum field?
Router(config-if)#no ip proxy-arp
Length of header in words (32-bit)
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
Both the TCP header and the encapsulated data

41. Enables debugging output for ARP transactions
Router#debug arp
88
2
DSCP (6-bit); ECN (2-bit)

42. What is prefix /26 in decimal notation?
255.255.255.192
ICMP Router Discovery Protocol
127.0.0.0/8
Router#show arp

43. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
192.88.99.0/24
8

44. Which IPv4 address range is reserved for link-local addresses when DHCP fails?
Acknowledgement
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
169.254.0.0/16
RFC 3330

45. What are classless routing protocols?
Internet Protocol
Protocols that include subnet masks in their routing updates
20 octets
Protocols that don't include subnet masks in their routing updates

46. What is the IPv4 Protocol number for ICMP?
DHCP
IANA
Reserved (1-bit); DF (1-bit); MF (1-bit)
1

47. What is the format of an ICMP header?
255.255.255.128
ECN-Echo
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Data Offset

48. What TCP/IP protocol suite layer corresponds to the session - presentation and application layers of the OSI model?
Router(config)#arp {ip-address} {mac-address} arpa
Application
Internet Assigned Numbers Authority
The next sequence number that the source expects to receive from the destination

49. What is the format of the DiffServ byte?
DSCP (6-bit); ECN (2-bit)
Internet Corporation for Assigned Network Numbers
198.18.0.0/15
Don't Fragment

50. What is TCP?
Transmission Control Protocol
0
They are the same byte - but the names and value interpretations are different
Internet Protocol

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IPV4 Addressing

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