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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. What is Layer 6 in the OSI Model?
Presentation
Every 32 ip's
IEEE 802.3u
60

2. IEEE Standards: Ethernet
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 802.3
IEEE 802.3u
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. What Layer does CDP operate at?
180 seconds
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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)#
Layer 2

4. Subnetting: What is a 255.255.252.0 in prefix notation
/22
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
DUAL: Difusing Update Algorithm

5. Switching Methods: What is Cut-through?
Every 128 ip's
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Switch forwards the frame as soon as it can
14 per network

6. Rip: What is the command to enable Ripv2?
Presentation
R1(config)#router rip - R1(config-router)#version 2
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

7. Subnetting: What is a 255.255.255.0 in prefix notation
Shortest path first - (SPF)
/24
IEEE 802.3u
Segments

8. What is the metric for RIP
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Hop Count
Every 16 ip's
R1(config)#router rip - R1(config-router)#version 2

9. 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.
DCE
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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.

10. What is the Transport PDU called?
Session
Frames
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Segments

11. Subnetting: What is a /18 in Decimal
Every 128 ip's
2 - each port is it's own collision domain
255.255.192.0
60

12. IEEE Standards: Fast Ethernet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R
IEEE 802.3u
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. What gets the clock rate - DCE or DTE?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
DCE
2 - the bridge separates the collision domain
Every 128 ip's

14. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Every 64 ip's
Hop Count
Network

15. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Physical
100
62 per network
Transport

16. Subnetting: What is a /27 in Decimal
255.255.255.224
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Frames

17. Using the magic number how to you figure the broadcast?
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.
Add the magic number to the network minus 1
Segments

18. OSPF: What is the default administrative distance?
Query and other router responds with a REPLY packet.
14 per network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
110

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
R1(config)#router rip - R1(config-router)#version 2
/28
30 per network
Every 64 ip's

20. What is the layer 2 PDU called?
/22
100
Frames
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

21. What is the boot sequence for Cisco Routers?
255.255.0.0
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

22. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Switch forwards the frame as soon as it can
Periodic Updates of their routing table
R3(config)#router rip - R3(config-router)#network 192.168.1.2
110

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
1-65535
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Application

24. What is Layer 4 in the OSI Model?
126 per network
R
Transport
2 - each port is it's own collision domain

25. RIP: What is the default Administrative Distance?
Every 128 ip's
120
Packets
100

26. CABLES: What is the difference between T568A and T568B?
110
Network
Pins 1+2 swap places with pins 3+6
30 per network

27. What is the layer 4 PDU called?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
62 per network
Segments

28. What is the Data-Link PDU called?
Frames
Router(config)#ip route {network address} {subnet-mask}
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.192.0

29. EIGRP: What is the range of Autonomous System numbers?
30 per network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1-65535
DCE

30. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Periodic Updates of their routing table
62 per network
Add the magic number to the network minus 1

31. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
IEEE 802.3u
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

32. What is the Network PDU called?
Presentation
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets
Every 4 ip's

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

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34. RIP Timers: What is an Flush Timer?
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.
Query and other router responds with a REPLY packet.
Segments

35. EIGRP: What is the default administrative distance?
Segments
100
/24
126 per network

36. Rip and EIGRP use what to keep other routers aware of their status?
62 per network
Periodic Updates of their routing table
255.255.255.128
IEEE 802.3z

37. What is the layer 3 PDU called?
Packets
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 frame once it completely receives it
Every 4 ip's

38. Subnetting: What is a /30 in Decimal
Every 32 ip's
Transport
255.255.255.252
Bellman-Ford

39. 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
1-65535
Periodic Updates of their routing table
2 hosts

40. Command for a static route with 'Next Hop' Address
Data-Link
255.255.255.224
Session
Router(config)#ip route {network address} {subnet-mask}

41. What is Layer 3 in the OSI Model?
255.255.255.224
Bellman-Ford
IEEE 802.3ab
Network

42. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Query and other router responds with a REPLY packet.
126 per network
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
60
Closest multiple of the magic number that is not over the interesting octets number.
Segments
14 per network

44. Rip: how do hold down timers work?
IEEE 802.3z
255.255.255.252
110
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

45. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
180 seconds
Closest multiple of the magic number that is not over the interesting octets number.
Frames

46. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Router(config)#ip route {exit-interface}
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
Closest multiple of the magic number that is not over the interesting octets number.

47. RIP Timers: What is an invalid Timer?
Layer 2
60
Periodic Updates of their routing table
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.

48. OSPF: What is the process used by OSPF to build a routing table (step by step)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/22
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 4 ip's

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

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50. What is Layer 5 in the OSI Model?
/24
Physical
Session
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.