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Cisco Network Fundamentals - 2

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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. Which of the following are true about IP?
Unique
It is the most common - and it encapsulates transport layer segments
FIN
UDP

2. MSN messenger uses TCP or UDP?
Purpose - ownership - and geographic location are key ways to divide a network
The source and destination port number
TCP
Destination network - next-hop - metric

3. Routers add routes for the connected networks to their ________________ .
Routing table
TCP. It makes larger demands on a network
Unique
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

4. What is the purpose of the ToS field in the IPv4 header?
128
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Static routing

5. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
FIN
IRC
1

6. Are well known ports registered
Packet
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
1
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

7. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Acknowledgment field significant
TCP uses flow control
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Ephermeral

8. What is the netstat utility used for on a host?
FTP
Not - these are done by other protocols in other layers
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
49152 - 65535.

9. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
Static routing
TCP. It makes larger demands on a network
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.

10. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Data link - physical
TCP uses flow control
Reliable - connection-oriented protocol (resends if not received)

11. Port 25 is?
SMTP
Does not
Packet
Unique

12. What are the three basic characteristics of IPv4?
1
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent
FTP

13. Port 20 is?
49152 - 65535.
Ephermeral
FTP
Connectionless - Best effort (unreliable) - media independent

14. What is the purpose of TCP/UDP port numbers?
SMTP
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
To track the different conversations crossing the network at the same time
FIN

15. Port 8080 is?
An alternate HTTP port
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
HTTPS (Secure HTTP)
Routers (the subnetting process)

16. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
To track the different conversations crossing the network at the same time
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Window size

17. What is a broadcast domain?
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
POP3
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Data link - physical

18. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Static routing
Not - these are done by other protocols in other layers
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer
Gateway

19. The three-way handshake performs what three functions?
SMTP
POP3
It Doesn't - TCP does
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port

20. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
Reliable - connection-oriented protocol (resends if not received)

21. What does segmentation provide to communications?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Ephermeral
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

22. List three network applications that use TCP
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Gateway
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer

23. IP is designed or not designed to track and manage the flow of packets?
It means ensuring that each segment that the source sends arrives at the destination
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Not - these are done by other protocols in other layers

24. Name the private address blocks
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
Acknowledgment field significant
False. It's like a file - only one process can read/write.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

25. What is the port range for dynamic or private ports
Routers (the subnetting process)
An alternate HTTP port
The source and destination port number
49152 - 65535.

26. How many bits are in an IPv6 address?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Window size
128
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th

27. List three network applications that use UDP
DNS - video-streaming - VoIP
FIN
Maximum transmission unit
Data link - physical

28. Ephermeral port is what type of port
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It works the same on all Layer 1 media
128
Dynamic / private

29. What is the port range for Registered ports
Static routing
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
Ephermeral
Data link - physical

30. Port 23 is?
Netstat -r and route print
Telnet
Decapsulation
53

31. How many bytes of overhead do TCP segments carry? How many does UDP carry?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
20 and 8
TCP uses flow control
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255

32. What is the default DNS port number?
Ephermeral
It works the same on all Layer 1 media
53
Telnet

33. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Connectionless - Best effort (unreliable) - media independent
HTTPS (Secure HTTP)
TCP. It makes larger demands on a network
User Datagram Protocol

34. What is the port range for well known ports
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
All
Allows the transport layer function on the destination host to reassemble segments in the right order
1

35. What four tasks does the network layer perform?
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
False. It's like a file - only one process can read/write.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP. It makes larger demands on a network

36. Port 520 is?
RIP (Routing Information Protocol)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1
To track the different conversations crossing the network at the same time

37. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Upper
An alternate HTTP port
Web browsing - email - file transfer

38. Why is IP 'media independent'?
It Doesn't - TCP does
49152 - 65535.
UDP - it sends datagrams as 'best effort'
It works the same on all Layer 1 media

39. Port 194 is?
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
IRC
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port

40. What is the proper order of SYN sequence?
All
RIP (Routing Information Protocol)
1
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

41. IP requires that each sending and receiving device have a __________ IP address.
TCP
Unique
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
SMTP

42. How does UDP keep track of sequence numbers?

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43. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?

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44. Which of the following are true about static and dynamic routing?
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Telnet
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Data link - physical

45. Which is a connectionless protocol - UDP or TCP?
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
UDP
Does not
Forward the packet to the default route interface (gateway) or just drop/discard the packets

46. What are the transport layer's responsibilities?
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
User Datagram Protocol
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
UDP - it sends datagrams as 'best effort'

47. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Transport
Decapsulation
Upper
FIN

48. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
User Datagram Protocol
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Connectionless

49. SYN is?
UDP
Data link - physical
Routers (the subnetting process)
Synchronize sequence numbers

50. Why does TCP use a sequence number in the header?
TCP. It makes larger demands on a network
49152 - 65535.
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th

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Cisco Network Fundamentals - 2

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