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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
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
53
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

2. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
Maximum transmission unit
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

3. TCP is a ________________ layer protocol.
Gateway
UDP
RIP (Routing Information Protocol)
Transport

4. Routers add routes for the connected networks to their ________________ .
Ephermeral
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Routing table
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

5. Port 23 is?
Maximum transmission unit
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.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Telnet

6. What is contained in the header of each segment or datagram?
Transport
Dynamic / private
The source and destination port number
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

7. Port 443 is?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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.
HTTPS (Secure HTTP)
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.

8. 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?
32 - there are four octets of 8 bits each in an IPv4 address
TCP uses flow control
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
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.

9. What is the protocol number for UDP?
TCP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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

10. In networking terms - What is reliability?
SMTP
TCP
It means ensuring that each segment that the source sends arrives at the destination
It Doesn't - TCP does

11. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
To track the different conversations crossing the network at the same time
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.
Upper

12. How many bits are in an IPv4 address?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
32 - there are four octets of 8 bits each in an IPv4 address
It works the same on all Layer 1 media
POP3

13. Port 520 is?
Destination network - next-hop - metric
RIP (Routing Information Protocol)
The source and destination port number
TFTP - Trivial File Transfer Protocol

14. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
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.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
IRC

15. Which of the following is true about IP?

16. 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?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
53
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
Static routing

17. On a particular network how would you determine the default gateway address for a host?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
The default gateway address is the address of a router interface that is connected to the same network as the host.
Gateway

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

19. UDP does or does not create a session?
UDP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Does not
Data link - physical

20. Port 8080 is?
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
Packet
An alternate HTTP port
TCP. It makes larger demands on a network

21. Port 69 is?
Maximum transmission unit
TFTP - Trivial File Transfer Protocol
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
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol

22. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
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
IRC
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

23. What is the purpose of TCP/UDP port numbers?
Web browsing - email - file transfer
To track the different conversations crossing the network at the same time
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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.

24. IP requires that each sending and receiving device have a __________ IP address.
Connectionless
Data link - physical
Unique
Purpose - ownership - and geographic location are key ways to divide a network

25. 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.
SMTP
DNS - video-streaming - VoIP
Data link - physical
Maximum transmission unit

26. Which of the following are not functions of the network layer?
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
Ephermeral
TCP. It makes larger demands on a network
UDP

27. Which of the following are true about network layer encapsulation?
IRC
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.
Decapsulation
UDP

28. What information does a router need to successfully forward packets?
Packet
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
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
UDP - it sends datagrams as 'best effort'

29. What are three key factors to consider when grouping hosts into a common network?
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.
User Datagram Protocol
Maximum transmission unit
Purpose - ownership - and geographic location are key ways to divide a network

30. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
False. It's like a file - only one process can read/write.
Connectionless
UDP - it sends datagrams as 'best effort'

31. What is the proper order of FIN sequence?
TCP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Routing table
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

32. Port 194 is?
Transport
SMTP
It Doesn't - TCP does
IRC

33. What is a broadcast domain?
Allows the transport layer function on the destination host to reassemble segments in the right order
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
128
False. It's like a file - only one process can read/write.

34. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
User Datagram Protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP. It makes larger demands on a network
Forward the packet to the default route interface (gateway) or just drop/discard the packets

35. What is the default DNS port number?
53
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
It is the most common - and it encapsulates transport layer segments
Synchronize sequence numbers

36. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
128
Window size
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Netstat -r and route print

37. How does UDP keep track of sequence numbers?

38. The three-way handshake performs what three functions?
Connectionless - Best effort (unreliable) - media independent
Connectionless
Routers (the subnetting process)
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

39. UDP stands for?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
User Datagram Protocol
UDP
Connectionless - Best effort (unreliable) - media independent

40. What is the port range for well known ports
RIP (Routing Information Protocol)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Connectionless - Best effort (unreliable) - media independent
False. It's like a file - only one process can read/write.

41. ACK is?
Acknowledgment field significant
TCP
Gateway
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

42. Which of the following are true about IP?
Acknowledgment field significant
TCP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
It is the most common - and it encapsulates transport layer segments

43. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
User Datagram Protocol
Decapsulation
49152 - 65535.
Synchronize sequence numbers

44. MSN messenger uses TCP or UDP?
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
User Datagram Protocol
Routing table

45. What two commands can be used to view a host's routing table?
Web browsing - email - file transfer
Netstat -r and route print
An alternate HTTP port
The source and destination port number

46. List three network applications that use UDP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
DNS - video-streaming - VoIP
FTP
An alternate HTTP port

47. Port 20 is?
32 - there are four octets of 8 bits each in an IPv4 address
FTP
Allows the transport layer function on the destination host to reassemble segments in the right order
53

48. List three network applications that use TCP
It means ensuring that each segment that the source sends arrives at the destination
Destination network - next-hop - metric
POP3
Web browsing - email - file transfer

49. Port 25 is?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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.
SMTP
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.

50. MTU stands for ?
It is the most common - and it encapsulates transport layer segments
Maximum transmission unit
TCP. It makes larger demands on a network
Static routing