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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. Adds a permanent static ARP entry for an Ethernet host
Router(config)#ip arp proxy disable
Router(config)#arp {ip-address} {mac-address} arpa
Socket
Padding of zeros to ensure that the header ends on a 32-bit boundary

2. What is IRDP?
IANA
60 octets
Router(config-if)#no ip proxy-arp
ICMP Router Discovery Protocol

3. What TCP/IP protocol suite layer corresponds to the network layer of the OSI model?
Length of header in words (32-bit)
2
Internet
Urgent

4. What is prefix /30 in decimal notation?
255.255.255.252
Router(config-if)#no ip proxy-arp
Maximum Segment Size (MSS)
47

5. What is FIN?
Both the TCP header and the encapsulated data
Padding of zeros to ensure that the header ends on a 32-bit boundary
Final
255.255.255.128

6. What is TCP?
ECN-Echo
Transmission Control Protocol
RFC 791
4

7. What field identifies where the TCP encapsulated data fits within the data stream from the sender?
4
ICANN and IANA
6
Sequence Number

8. What is the format of a UDP header?
Source Port (16-bit); Destination Port (16-bit); UDP Length (16-bit); Checksum (16-bit)
4
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
4

9. What is the format of the Flags field in the IPv4 header?
Largest segment size that the sender is willing to accept
Reserved (1-bit); DF (1-bit); MF (1-bit)
Internet Protocol
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

10. Which IPv4 address range is reserved for use in documentation and example code?
88
192.0.2.0/24
Reserved (1-bit); DF (1-bit); MF (1-bit)
Router Advertisement

11. What is ACK?
6
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
169.254.0.0/16
Acknowledgement

12. What mechanism is used by TCP to regulate the flow of segments?
ICANN and IANA
RIPv1 and IGRP
Windowing
IPv4 and IPv6

13. What is a TCP Acknowledgement Number?
Don't Fragment
46
255.255.255.240
The next sequence number that the source expects to receive from the destination

14. Who assigns IP address space to its own customers?
Destination Unreachable
10.0.0.0/8; 172.16.0.0/12; 192.168.0.0/16
Push
LIRs

15. What is the value of the TCP Reserved field?
Method where routers - by responding to ARP requests for IP addresses in different subnets - make themselves available to hosts with no default gateway configured
Synchronize
0
127.0.0.0/8

16. What is the format of the TCP Header Length field?
Used by a host to obtain the IP address associated with another host's MAC address
Both the TCP header and the encapsulated data
Length of header in words (32-bit)
LIRs

17. What are the most frequently used options in the IPv4 header?
Loose source routing; Strict source routing; Record route; Timestamp
Internet Corporation for Assigned Network Numbers
Router#show arp
6

18. What is SYN?
RFC 791
Synchronize
They are the same byte - but the names and value interpretations are different
9

19. Which IPv4 address range is reserved for IPv6 to IPv4 (6to4) relays (RFC 3068)?
64
192.88.99.0/24
3
URG flag set

20. What are the most common IP version numbers?
Transmission Control Protocol
IPv4 and IPv6
More Fragments follow
Router(config-if)#no ip proxy-arp

21. What is the TTL field in the IPv4 header?
Padding of zeros to ensure that the header ends on a 32-bit boundary
Router(config)#ip netmask-format {bit-count | decimal | hexadecimal}
60 octets
Time to Live

22. Deletes dynamic entries from the ARP cache
89
46
Router#clear arp-cache [{interface {interface}} | {ip-address}]
Used by IRDP on some operating systems to discover local routers

23. What are classful routing protocols?

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24. Displays the ARP cache of a router
1
6
Router#show arp
1

25. What is the ARP Operation value for an Inverse ARP Reply?
An ARP request issued by a host with its own IPv4 address as the target address
Transmission Control Protocol
Windowing
9

26. Disables proxy ARP on an interface
Router(config-if)#no ip proxy-arp
255.255.255.248
The next sequence number that the source expects to receive from the destination
0

27. What is RIR?
0
An ARP request issued by a host with its own IPv4 address as the target address
Local Internet Registry
Regional Internet Registry

28. What is PSH?
Push
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
IP Precedence (3-bit); ToS (4-bit); Reserved (1-bit)
198.18.0.0/15

29. What is the function of ICMP router advertisement and router selection messages?
Internet Protocol
Host-to-host
Used by IRDP on some operating systems to discover local routers
RIPv1 and IGRP

30. Who allocates public IP address ranges to NIRs or LIRs?
Router(config-if)#arp timeout {seconds}
Each router decrements the TTL
RIRs
All Internet Registries

31. What is the format of the Flags field in the TCP header?
Internet Control Message Protocol
127.0.0.0/8
1
CWR (1-bit); ECE (1-bit); URG (1-bit); ACK (1-bit); PSH (1-bit); RST (1-bit); SYN (1-bit); FIN (1-bit)

32. What is the ARP Operation value for an Inverse ARP Request?
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Congestion Window Reduced
8
60 octets

33. What mechanism is used by TCP to provided ordered segment delivery?
Echo
Sequence Numbers
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
Internet Protocol

34. What is Inverse ARP?

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35. What is the first octet rule for IPv4 address classes in decimal?
0.0.0.0/8
Synchronize
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254
0x0800

36. What is the ARP Protocol type value for IPv4?
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
Padding of zeros to ensure that the header ends on a 32-bit boundary
Length of header in words (32-bit)
0x0800

37. What is the Fragment Offset field in the IPv4 header?
Mostly large ISPs - enterprises - or academic institutions
RIRs
Offset - in units of eight octets - from the beginning of the original header to the beginning of the fragment
Maximum Segment Size (MSS)

38. What are the steps to subnet an IPv4 address?
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
Time to Live
Don't Fragment
RFC 3330

39. What is the IPv4 Protocol number of RSVP?
Host-to-host
46
Open Systems Interconnection
NIRs

40. Who group public IPv4 address space by major geographic region?
Data Offset
169.254.0.0/16
ICANN and IANA
Maximum Segment Size (MSS)

41. What are the IP Precedence values?
ICANN and IANA
89
0 Routine; 1 Priority; 2 Immediate; 3 Flash; 4 Flash Override; 5 Critical; 6 Internetwork Control; 7 Network Control
ICMP Router Discovery Protocol

42. How does the layers of the TCP/IP protocol suite map to the 7 layers of the OSI model?
An ARP request issued by a host with its own IPv4 address as the target address
Internet Service Provider
1-2 Network interface; 3 Internet; 4 Host-to-host; 5-7 Application
60 octets

43. What is ICMP Type 3?
Protocols that don't include subnet masks in their routing updates
Internet Control Message Protocol
Destination Unreachable
ICMP Router Discovery Protocol

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

45. What is ICMP Type 11?
Protocols that don't include subnet masks in their routing updates
169.254.0.0/16
255.255.255.128
Time Exceeded

46. What is LIR?
Windowing
Router(config-if)#arp timeout {seconds}
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
Local Internet Registry

47. What is the format of an ARP packet?
Destination Unreachable
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
Regional Internet Registry
Class A 1-126; Class B 128-191; Class C 192-223; Class D 224-239; Class E 240-254

48. What is the format of an ICMP header?
88
Address Resolution Protocol
Type (8-bit); Code (8-bit); Checksum (16-bit); Variable fields
Time Exceeded

49. What is prefix /25 in decimal notation?
255.255.255.128
Used by a host to obtain the IP address associated with another host's MAC address
9
Internet Protocol

50. What mechanisms are used by TCP to provide reliable segment delivery?
Internet Corporation for Assigned Network Numbers
Final
ECN-Echo
Acknowledgements - checksums and timers

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IPV4 Addressing

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