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. Subnetting: What is a 255.255.252.0 in prefix notation
Every 128 ip's
/22
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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.


2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Bandwidth - Delay - reliability and Load
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)#


3. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
255.255.192.0
Closest multiple of the magic number that is not over the interesting octets number.
/22


4. OSPF: how do you change the cost of an interface for OSPF?
Physical
Packets
Pins 1+2 swap places with pins 3+6
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change


5. What is Layer 7 in the OSI Model?
Application
DUAL: Difusing Update Algorithm
255.255.255.252
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)#


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

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7. Subnetting: What is a /25 in Decimal
Network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
255.255.255.128
Add the magic number to the network minus 1


8. Rip: how do hold down timers work?
/9
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:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Data-Link


9. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.0.0
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Hop Count


10. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
Shortest path first - (SPF)
126 per network
100


11. CABLES: What is the T568B Pinout Standard?
Pins 1+2 swap places with pins 3+6
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
14 per network


12. RIP Timers: What is an invalid Timer?
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.
DUAL: Difusing Update Algorithm
120
255.255.255.224


13. Symbol for EIGRP on a Show ip route
Application
D
255.255.255.224
1-65535


14. RIP: What Algorithm is used in RIP>
110
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Bellman-Ford
Segments


15. Symbol for Rip on a Show ip route
Periodic Updates of their routing table
126 per network
R
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)#


16. What is Layer 6 in the OSI Model?
Presentation
255.255.255.128
IEEE 802.3
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds


17. What is Layer 1 in the OSI Model?
/28
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Pins 1+2 swap places with pins 3+6
Physical


18. What is the layer 4 PDU called?
IEEE 802.3ab
255.255.0.0
Segments
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240


19. Rip: What is the command to enable Ripv2?
2 hosts
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R1(config)#router rip - R1(config-router)#version 2
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.


20. What Layer does CDP operate at?
110
Layer 2
Add the magic number to the network minus 1
Session


21. What is Layer 3 in the OSI Model?
Bandwidth - Delay - reliability and Load
Shortest path first - (SPF)
Network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds


22. How many Collision domains are there on a with 1 switch 2 computers?

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23. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Every 128 ip's
/22
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.
R3(config)#router rip - R3(config-router)#network 192.168.1.2


24. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
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
255.255.0.0
Every 32 ip's
126 per network


25. EIGRP: What is the hello packet used for?
Session
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds


26. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Bandwidth - Delay - reliability and Load
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
Every 8 ip's
30 per network


27. EIGRP: What is the default administrative distance?
Transport
Show ip eigrp topology
Layer 2
100


28. What gets the clock rate - DCE or DTE?
Frames
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
DCE
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change


29. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Segments
Periodic Updates of their routing table
Every 128 ip's


30. Rip: What causes a triggered update?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/24
Hop Count
IEEE 802.3


31. OSPF: What is the process used by OSPF to build a routing table (step by step)
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.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
/28
62 per network


32. CABLES: What is the difference between T568A and T568B?
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
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


33. OSPF: What Algorithm is used?
R
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Shortest path first - (SPF)
Physical


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

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35. Command for a static route with 'Next Hop' Address
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)#ip route {network address} {subnet-mask}
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)


36. RIP Timers: What is an Holddown Timer?
60
/9
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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


37. EIGRP: What is the range of Autonomous System numbers?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252
/24
1-65535


38. IEEE Standards: Ethernet
Physical
Bellman-Ford
IEEE 802.3
Periodic Updates of their routing table


39. What is the Transport PDU called?
255.255.192.0
Segments
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
IEEE 802.3u


40. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
Frames
Hop Count
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)


41. OSPF: What is the default administrative distance?
255.255.0.0
110
Frames
Packets


42. CABLES: What is the T568A Pinout Standard?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 128 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2


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

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44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Switch forwards the frame as soon as it can
Physical
Packets
30 per network


45. Subnetting: What is a /30 in Decimal
Transport
180
255.255.255.252
IEEE 802.3z


46. Subnetting: where do the networks break with a /26

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47. Subnetting: What is a /18 in Decimal
Router(config)#ip route {exit-interface}
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.192.0
Show ip eigrp topology


48. Rip Timers: How long is the default for Holddown timer.
/9
/24
255.255.192.0
180


49. What are the comands to set the clock rate in a serial connection?
Show ip eigrp topology
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Bandwidth - Delay - reliability and Load


50. Rip: What does v2 have that v1 does not?
126 per network
DUAL: Difusing Update Algorithm
Packets
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization