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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 Layer 2 in the OSI Model?
Data-Link
/22
Frames
Presentation

2. What is the Data-Link PDU called?
2 - each port is it's own collision domain
Frames
255.255.255.224
Transport

3. Subnetting: What is a 255.128.0.0 in prefix notation
Network
Router(config)#ip route {exit-interface}
110
/9

4. What are the commands to setup SSH?
Every 128 ip's
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.0.0
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)#

5. IEEE Standards: Ethernet
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1-65535
IEEE 802.3
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

6. What is Layer 6 in the OSI Model?
Presentation
Every 64 ip's
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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

7. What is Layer 1 in the OSI Model?
Physical
DUAL: Difusing Update Algorithm
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Query and other router responds with a REPLY packet.

8. RIP Timers: What is an invalid Timer?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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.
255.255.255.252
Application

9. OSPF: What is the default administrative distance?
Frames
Closest multiple of the magic number that is not over the interesting octets number.
Pins 1+2 swap places with pins 3+6
110

10. What is Layer 7 in the OSI Model?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Application
180
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

11. EIGRP: What is the hello packet used for?
2 - the bridge separates the collision domain
R1(config)#router rip - R1(config-router)#version 2
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
14 per network

12. Subnetting: where do the networks break with a /27

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13. Rip: Command to prevent rip updates on an interface
110
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

14. Subnetting: What is a 255.255.255.240 in prefix notation
/28
255.255.255.224
2 hosts
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

15. What gets the clock rate - DCE or DTE?
DCE
Shortest path first - (SPF)
/9
Hop Count

16. IEEE Standards: Fast Ethernet
IEEE 802.3u
180 seconds
Every 128 ip's
Every 8 ip's

17. How many Collision domains are there on a with 1 hub and 2 computers?
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
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1 - everything hooked to the hub is in the same collision domain
255.255.255.224

18. Switching Methods: What is Cut-through?
IEEE 802.3
Switch forwards the frame as soon as it can
30 per network
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

19. Command for a static route with exit interface
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)#ip route {exit-interface}
180 seconds
Periodic Updates of their routing table

20. What is Layer 4 in the OSI Model?
62 per network
Transport
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.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

21. RIP Timers: What is an Holddown Timer?
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
Hop Count
Every 8 ip's
255.255.255.224

22. What is the Network PDU called?
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
Shortest path first - (SPF)
Packets
Segments

23. Subnetting: What is a /27 in Decimal
/24
255.255.255.224
Transport
120

24. Rip: how do hold down timers work?
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
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.0.0
/28

25. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Every 32 ip's
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
2 - the bridge separates the collision domain
255.255.0.0

26. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3
Session
IEEE 802.3z

27. Subnetting: What is a /16 in Decimal
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
2 hosts
Hop Count
255.255.0.0

28. RIP: What is the default Administrative Distance?
120
Hop Count
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
14 per network

29. What is the metric for EIGRP
Router(config)#ip route {exit-interface}
120
Add the magic number to the network minus 1
Bandwidth - Delay - reliability and Load

30. Command for a static route with 'Next Hop' Address
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3
Router(config)#ip route {network address} {subnet-mask}
255.255.255.252

31. EIGRP: What is the default administrative distance?
100
Shortest path first - (SPF)
60
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

32. What Layer does CDP operate at?
/24
1-65535
Layer 2
Bellman-Ford

33. CABLES: What is the T568A Pinout Standard?
Every 4 ip's
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
DUAL: Difusing Update Algorithm
IEEE 802.3z

34. CABLES: What is the difference between T568A and T568B?
IEEE 802.3ab
Periodic Updates of their routing table
126 per network
Pins 1+2 swap places with pins 3+6

35. What is Layer 3 in the OSI Model?
Closest multiple of the magic number that is not over the interesting octets number.
110
Switch forwards frame once it completely receives it
Network

36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
30 per network
DUAL: Difusing Update Algorithm
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

37. EIGRP: How do you view if there are any successor routes?
Closest multiple of the magic number that is not over the interesting octets number.
Every 8 ip's
Show ip eigrp topology
255.255.255.224

38. EIGRP: What packet is used to propagate routing information?
Data-Link
Closest multiple of the magic number that is not over the interesting octets number.
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

39. Subnetting: What is a 255.255.255.0 in prefix notation
/24
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Transport
Periodic Updates of their routing table

40. 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
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Bellman-Ford
Router(config)#ip route {network address} {subnet-mask}

41. Subnetting: What is a 255.255.252.0 in prefix notation
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
/22
255.255.0.0
255.255.255.252

42. EIGRP: What is the range of Autonomous System numbers?
255.255.255.252
1-65535
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards the frame as soon as it can

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

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44. IEEE Standards: Gibabit Ethernet (Fibre)
Every 4 ip's
DUAL: Difusing Update Algorithm
Network
IEEE 802.3z

45. Subnetting: What is a /30 in Decimal
Bellman-Ford
30 per network
255.255.255.252
Network

46. What is the layer 2 PDU called?
Frames
100
/28
Network

47. What are the comands to set the clock rate in a serial connection?
180 seconds
/28
Shortest path first - (SPF)
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

48. Symbol for EIGRP on a Show ip route
Every 32 ip's
Application
D
/24

49. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Pins 1+2 swap places with pins 3+6
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
DCE

50. Name the OSI Layers
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.
Frames
Segments
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

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