CCENT

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. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Switch forwards frame once it completely receives it
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
2 - the bridge separates the collision domain


2. EIGRP: What is the range of Autonomous System numbers?
1-65535
255.255.255.252
Switch forwards the frame as soon as it can
2 - the bridge separates the collision domain


3. Command for a static route with exit interface
30 per network
Router(config)#ip route {exit-interface}
180 seconds
255.255.255.252


4. What is the boot sequence for Cisco Routers?
Packets
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
2 - the bridge separates the collision domain
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


5. What is Layer 4 in the OSI Model?
Show ip eigrp topology
Transport
Shortest path first - (SPF)
110


6. How many Collision domains are there on a with 1 hub and 2 computers?
Segments
Every 4 ip's
1 - everything hooked to the hub is in the same collision domain
Router(config)#ip route {network address} {subnet-mask}


7. 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
Packets
Bandwidth - Delay - reliability and Load
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown


8. Subnetting: What is a 255.255.255.240 in prefix notation
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.
/28
Add the magic number to the network minus 1
/24


9. Switching Methods: What is Fragment-free?
Physical
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Switch forwards the frame as soon as it can
1-65535


10. EIGRP: What packet is used to propagate routing information?
DCE
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Presentation


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

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12. What is Layer 7 in the OSI Model?
Application
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Frames
30 per network


13. Rip: Command to prevent rip updates on an interface
60
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE


14. Name the OSI Layers
R3(config)#router rip - R3(config-router)#network 192.168.1.2
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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


15. Name the TCP/IP Layers
Every 4 ip's
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)


16. What is the Transport PDU called?
/24
Every 4 ip's
Segments
2 - each port is it's own collision domain


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

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18. Subnetting: What is a /30 in Decimal
255.255.255.224
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.252
30 per network


19. EIGRP: What is the name of the algorithm used for EIGRP?
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
Switch forwards frame once it completely receives it
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


20. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Router(config)#ip route {exit-interface}
14 per network
30 per network


21. RIP Timers: What is an Flush Timer?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Query and other router responds with a REPLY packet.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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.


22. Symbol for EIGRP on a Show ip route
IEEE 802.3ab
D
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.
Switch forwards frame after receiving the 1st 64bytes to insure no errors.


23. Rip Timers: How long is the default for Flush timer.
60
Every 16 ip's
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
DUAL: Difusing Update Algorithm


24. Command for a static route with 'Next Hop' Address
Closest multiple of the magic number that is not over the interesting octets number.
Router(config)#ip route {network address} {subnet-mask}
Segments
Every 8 ip's


25. What is the layer 4 PDU called?
DCE
Segments
62 per network
IEEE 802.3


26. EIGRP: What is the default administrative distance?
100
Presentation
255.255.255.224
110


27. What gets the clock rate - DCE or DTE?
255.255.255.128
DCE
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.
Frames


28. OSPF: What Algorithm is used?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Router(config)#ip route {exit-interface}
Shortest path first - (SPF)
R1(config)#router rip - R1(config-router)#version 2


29. What is the layer 3 PDU called?
Switch forwards frame once it completely receives it
Bellman-Ford
100
Packets


30. EIGRP: What packet is used to search for networks?
Every 16 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
Query and other router responds with a REPLY packet.
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.


31. What is Layer 6 in the OSI Model?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Presentation
120
126 per network


32. OSPF: What is the default administrative distance?
Switch forwards the frame as soon as it can
110
Every 16 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical


33. IEEE Standards: Fast Ethernet
Every 8 ip's
IEEE 802.3u
Router(config)#ip route {network address} {subnet-mask}
Packets


34. What is Layer 2 in the OSI Model?
Data-Link
Frames
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


35. What is the layer 2 PDU called?
Every 64 ip's
Frames
110
Query and other router responds with a REPLY packet.


36. Using the magic number how to you figure the broadcast?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Add the magic number to the network minus 1
120
Packets


37. Rip: What is the command to enable Ripv2?
255.255.255.128
Show ip eigrp topology
R1(config)#router rip - R1(config-router)#version 2
126 per network


38. What is Layer 3 in the OSI Model?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Add the magic number to the network minus 1
Packets
Network


39. Using the magic number how to you figure the network?
Every 64 ip's
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
IEEE 802.3ab


40. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Show ip eigrp topology
Pins 1+2 swap places with pins 3+6
255.255.192.0


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

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42. 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
Segments
Hop Count
Transport


43. IEEE Standards: Gibabit Ethernet (Copper)
126 per network
/24
IEEE 802.3ab
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


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

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45. 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.
Packets
255.255.255.252
Application


46. What is Layer 5 in the OSI Model?
2 - each port is it's own collision domain
255.255.255.252
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Session


47. Symbol for Rip on a Show ip route
(5)Application - (4)Transport - (3)Internet - (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.
R
Periodic Updates of their routing table


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

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49. What is the metric for RIP
Hop Count
126 per network
IEEE 802.3u
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE


50. How do you find the magic number for subnetting?
255.255.255.128
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
126 per network
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240