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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. What is the IPv4 Protocol number for GRE?
47
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
1
ICANN and IANA

2. Deletes dynamic entries from the ARP cache
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
Router#clear arp-cache [{interface {interface}} | {ip-address}]
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

3. What is ECE?
46
Push
ECN-Echo
Electrical/Optical - Mechanical - Functional and Procedural

4. What is FIN?
Internet Protocol
Final
The next sequence number that the source expects to receive from the destination
Router#clear arp-cache [{interface {interface}} | {ip-address}]

5. What is the format of the Flags field in the TCP header?
Internet Corporation for Assigned Network Numbers
Data Offset
Router(config-if)#no ip redirects
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

6. What is the minimum length of an IPv4 header?
Mostly large ISPs - enterprises - or academic institutions
Network interface
20 octets
Regional Internet Registry

7. What are classless routing protocols?
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
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
Protocols that include subnet masks in their routing updates
RFC 3330

8. What is the format of the DiffServ byte?
Reserved (1-bit); DF (1-bit); MF (1-bit)
255.255.255.240
LIRs
DSCP (6-bit); ECN (2-bit)

9. What is the format of the TCP Header Length field?
Length of header in words (32-bit)
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
Identifier; Flags and Fragmentation Offset

10. Which protocol has mostly replaced Reverse ARP?
198.18.0.0/15
DHCP
255.255.255.240
Internet Protocol

11. How can the receiver determine the size of a packet's data payload based on the IPv4 header?
127.0.0.0/8
255.255.255.192
Subtract Header Length field from Total Length field
Router#debug arp

12. What is ISP?
ICANN
17
Internet Service Provider
Echo Reply

13. Which RFC defines the private IPv4 address ranges?
RFC 1918
Each router decrements the TTL
Padding of zeros to ensure that the header ends on a 32-bit boundary
Mostly large ISPs - enterprises - or academic institutions

14. What is proxy ARP?
Router(config-if)#no ip redirects
Uniquely identify every application in the network
Number of octets to be added to the Sequence Number to indicate the end of the urgent data
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured

15. What is the format of the ToS field?
IANA
Sequence Number + Data payload octets + 1
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Windowing

16. Which IPv4 address range is reserved for self-identification on a local subnet?
0.0.0.0/8
Router(config-if)#no ip proxy-arp
Windowing
1

17. What is PSH?
ECN-Echo
Router Advertisement
Push
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}

18. Who owns the processes by which public IP address space and AS numbers are allocated and assigned?
DSCP (6-bit); ECN (2-bit)
4
ICANN
Redirect

19. What is ICANN?
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
Internet Corporation for Assigned Network Numbers
0.0.0.0/8
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

20. What is the ARP Protocol address length value for IPv4?
Urgent
Host-to-host
IANA
4

21. What is prefix /29 in decimal notation?
255.255.255.248
192.88.99.0/24
Time to Live
Regional Internet Registry

22. What is the IPv4 Protocol number for IGMP?
2
The next sequence number that the source expects to receive from the destination
Used by routers to notify hosts of another router on the data link that should be used for a particular destination
1

23. Which IPv4 address range is reserved for use in documentation and example code?
Time Exceeded
192.0.2.0/24
2
Congestion Window Reduced

24. Configures how long a dynamically learned protocol address and its corresponding hardware address remains in the ARP cache
Router(config-if)#arp timeout {seconds}
Mostly large ISPs - enterprises - or academic institutions
255.255.255.192
169.254.0.0/16

25. What is the maximum length of an IPv4 header?
Sequence Number
60 octets
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Time Exceeded

26. What is the IPv4 Protocol number for IP in IP encapsulation?
17
255.255.255.248
Subtract Header Length field from Total Length field
4

27. What is the IPv4 Protocol number for OSPF?
89
0x0800
Internet Corporation for Assigned Network Numbers
NIRs

28. What is the the MF-bit in the IPv4 header?
More Fragments follow
LIRs
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
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

29. What is covered by the TCP Checksum field?
169.254.0.0/16
Both the TCP header and the encapsulated data
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control

30. What is the first octet rule for IPv4 address classes in binary?
Socket
Reserved (1-bit); DF (1-bit); MF (1-bit)
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
127.0.0.0/8

31. Displays the ARP cache of a router
RFC 791
ECN-Echo
Regional Internet Registry
Router#show arp

32. What is LIR?
IANA
Used by IRDP on some operating systems to discover local routers
Local Internet Registry
IANA

33. Who are LIRs?
Mostly large ISPs - enterprises - or academic institutions
Congestion Window Reduced
255.255.255.192
Host-to-host

34. Who allocates IP address space and AS numbers to RIRs?
IANA
0
Class A 0; Class B 10; Class C 110; Class D 1110; Class E 1111
Internet

35. Who can assign IP address space to end user organizations?
Reserved (1-bit); DF (1-bit); MF (1-bit)
All Internet Registries
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
255.255.255.128

36. What is RIR?
Socket
Regional Internet Registry
ICANN
2

37. Who is responsible for maintaining the official assignments of TCP and UDP port numbers for specific uses?
1
IANA
64
Destination Unreachable

38. What is ICMP Type 9?
DHCP
Host-to-host
Router Advertisement
Internet Corporation for Assigned Network Numbers

39. What is TCP?
Each router decrements the TTL
Transmission Control Protocol
DHCP
255.255.255.248

40. What is ICMP Type 11?
Time Exceeded
6
Sequence Numbers
Sequence Number + Data payload octets + 1

41. What is the difference between the ToS and the DiffServ byte?
They are the same byte - but the names and value interpretations are different
Router(config)#ip arp proxy disable
46
47

42. Who assigns IP address space to its own customers?
Application
Sequence Numbers
LIRs
60 octets

43. What is the format of a TCP header?
8
Time to Live
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
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

44. Adds a permanent static ARP entry for an Ethernet host
Router(config)#arp {ip-address} {mac-address} arpa
169.254.0.0/16
Echo Reply
RFC 1918

45. What is the ARP Operation value for an ARP Request?
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
Minimize Delay (1-bit); Maximise Throughput (1-bit); Maximise Reliability (1-bit); Minimize Monetary Cost (1-bit)
Router(config-if)#no ip proxy-arp
1

46. What is OSI?
Open Systems Interconnection
Acknowledgement
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
60 octets

47. What is prefix /25 in decimal notation?
Open Systems Interconnection
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
255.255.255.128
Electrical/Optical - Mechanical - Functional and Procedural

48. Who group public IPv4 address space by major geographic region?
Mostly large ISPs - enterprises - or academic institutions
20 octets
ICANN and IANA
60 octets

49. What is the recommended default TTL?
Both the TCP header and the encapsulated data
64
Mostly large ISPs - enterprises - or academic institutions
Acknowledgement

50. What is prefix /28 in decimal notation?
RFC 1918
Router#debug arp
255.255.255.240
88

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IPV4 Addressing

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