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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. Switching Methods: What is Cut-through?
255.255.0.0
/9
DUAL: Difusing Update Algorithm
Switch forwards the frame as soon as it can

2. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 16 ip's
2 - each port is it's own collision domain
Transport

3. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
Frames
Application
110

4. Subnetting: where do the networks break with a /28

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5. What are the commands to setup SSH?
Router(config)#ip route {network address} {subnet-mask}
Network
Router(config)#hostname R1 - R1(config)#line VTY 0 4 - R1(config-line)#login local - R1(config-line)#transport input telnet ssh - R1(config-line)#exit - R1(config)#username {user} password {pass} - R1(config)#ip domain-name {domainname} - R1(config)#
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

6. Rip: how do hold down timers work?
Segments
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1. Router receives update from neighbor indicating a route down - Router makes route as down and starts holddown timer - If router gets an update indicating route is back holddown is removed - If an update is received indicating route is down again i

7. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
/9
Segments
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

8. What are the comands to set the clock rate in a serial connection?
255.255.192.0
Router(config)#ip route {network address} {subnet-mask}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Segments

9. Subnetting: What is a /30 in Decimal
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R
255.255.255.252
Every 128 ip's

10. Subnetting: What is a /27 in Decimal
120
Bandwidth - Delay - reliability and Load
Router(config)#ip route {exit-interface}
255.255.255.224

11. Using the magic number how to you figure the network?
Every 32 ip's
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)#router rip - R1(config-router)#version 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

12. RIP Timers: What is an Flush Timer?
Data-Link
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Segments
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.

13. RIP Timers: What is an Holddown Timer?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Frames
This timer stabilizes routing information and helps prevent routing loops during periods when the topology is converging on new information. Once a route is marked as unreachable - it must stay in holddown long enough for all routers in the topology
IEEE 802.3z

14. What is Layer 2 in the OSI Model?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Data-Link
1 - everything hooked to the hub is in the same collision domain
D

15. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Transport
30 per network
R
IEEE 802.3z

16. Rip: Command to prevent rip updates on an interface
126 per network
255.255.255.252
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Query and other router responds with a REPLY packet.

17. How many Collision domains are there on a with 1 hub and 2 computers?
1 - everything hooked to the hub is in the same collision domain
180 seconds
Switch forwards the frame as soon as it can
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65

18. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Switch forwards the frame as soon as it can
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Pins 1+2 swap places with pins 3+6

19. What is Layer 6 in the OSI Model?
Presentation
Periodic Updates of their routing table
Router(config)#ip route {network address} {subnet-mask}
180 seconds

20. Subnetting: What is a 255.255.252.0 in prefix notation
Every 16 ip's
Hop Count
/22
Query and other router responds with a REPLY packet.

21. Subnetting: where do the networks break with a /30

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22. What Layer does CDP operate at?
IEEE 802.3ab
/28
Layer 2
Closest multiple of the magic number that is not over the interesting octets number.

23. What is Layer 7 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
14 per network
Switch forwards the frame as soon as it can
Application

24. Subnetting: What is a /18 in Decimal
Router(config)#ip route {network address} {subnet-mask}
255.255.192.0
Every 128 ip's
255.255.255.224

25. Subnetting: where do the networks break with a /29

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26. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
255.255.0.0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R
255.255.255.252

27. Subnetting: What is a /16 in Decimal
180 seconds
255.255.0.0
Switch forwards frame once it completely receives it
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65

28. Command for a static route with exit interface
Segments
Router(config)#ip route {exit-interface}
Periodic Updates of their routing table
Switch forwards frame once it completely receives it

29. Switching Methods: What is Store and Forward?
Every 64 ip's
Presentation
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards frame once it completely receives it

30. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 8 ip's
Physical
/22

31. EIGRP: What is the range of Autonomous System numbers?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Every 16 ip's
1-65535
Packets

32. How do you find the magic number for subnetting?
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/24
IEEE 802.3u

33. Rip: What does v2 have that v1 does not?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Shortest path first - (SPF)
Query and other router responds with a REPLY packet.
110

34. Rip: What is the command to enable Ripv2?
255.255.255.128
DUAL: Difusing Update Algorithm
2 - the bridge separates the collision domain
R1(config)#router rip - R1(config-router)#version 2

35. Subnetting: What is a /25 in Decimal
180
255.255.255.128
1 - everything hooked to the hub is in the same collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

36. Name the TCP/IP Layers
1. Router receives update from neighbor indicating a route down - Router makes route as down and starts holddown timer - If router gets an update indicating route is back holddown is removed - If an update is received indicating route is down again i
Switch forwards the frame as soon as it can
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

37. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
/22
Add the magic number to the network minus 1
100

38. OSPF: What is the default administrative distance?
Every 128 ip's
Frames
110
2 - the bridge separates the collision domain

39. CABLES: What is the T568B Pinout Standard?
2 - the bridge separates the collision domain
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
126 per network
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

40. EIGRP: What is the default administrative distance?
60
Every 64 ip's
Every 4 ip's
100

41. RIP: What is the default Administrative Distance?
DUAL: Difusing Update Algorithm
120
Physical
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

42. OSPF: What is the process used by OSPF to build a routing table (step by step)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Session
Bellman-Ford

43. RIP Timers: What is an invalid Timer?
Every 32 ip's
F an update has not been received to refresh an existing route after 180 seconds (the default) - the route is marked as invalid by setting the metric to 16. The route is retained in the routing table until the flush timer expires.
IEEE 802.3z
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.

44. OSPF: how do you change the cost of an interface for OSPF?
Presentation
/24
Shortest path first - (SPF)
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

45. CABLES: What is the T568A Pinout Standard?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
IEEE 802.3u
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

46. What is the Network PDU called?
Frames
Packets
/9
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

47. Using the magic number how to you figure the broadcast?
DCE
Add the magic number to the network minus 1
14 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

48. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
2 - the bridge separates the collision domain
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Physical

49. What is the metric for RIP
Pins 1+2 swap places with pins 3+6
Router(config)#ip route {exit-interface}
Add the magic number to the network minus 1
Hop Count

50. What is the layer 4 PDU called?
1. Router receives update from neighbor indicating a route down - Router makes route as down and starts holddown timer - If router gets an update indicating route is back holddown is removed - If an update is received indicating route is down again i
255.255.0.0
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Segments

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