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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. EIGRP: What is the default administrative distance?
60
Router(config)#ip route {exit-interface}
100
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

2. 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
Every 32 ip's
255.255.192.0
Periodic Updates of their routing table

3. What is the Data-Link PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Frames
/22
Every 64 ip's

4. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
IEEE 802.3ab
2 hosts
Frames
Every 64 ip's

5. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Layer 2
Every 16 ip's
/22

6. Using the magic number how to you figure the network?
Frames
Closest multiple of the magic number that is not over the interesting octets number.
255.255.192.0
R

7. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
Every 32 ip's
2 - each port is it's own collision domain
/24

8. EIGRP: What is the name of the algorithm used for EIGRP?
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.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
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)#
DUAL: Difusing Update Algorithm

9. 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
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
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Bellman-Ford

10. Subnetting: What is a /25 in Decimal
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.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
255.255.255.128
Every 64 ip's

11. IEEE Standards: Fast Ethernet
Switch forwards frame once it completely receives it
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3u
IEEE 802.3ab

12. RIP: What is the default Administrative Distance?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
120
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
180

13. What is the metric for EIGRP
60
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Session
Bandwidth - Delay - reliability and Load

14. Rip and EIGRP use what to keep other routers aware of their status?
1-65535
Add the magic number to the network minus 1
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Periodic Updates of their routing table

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

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

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

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18. What is the layer 2 PDU called?
Session
Frames
2 - the bridge separates the collision domain
Every 4 ip's

19. CABLES: What is the T568B Pinout Standard?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
126 per network

20. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
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.
/24
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Every 32 ip's

21. What are the commands to setup SSH?
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)#
Frames
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

22. Switching Methods: What is Store and Forward?
IEEE 802.3
D
Switch forwards frame once it completely receives it
Packets

23. EIGRP: What packet is used to propagate routing information?
Data-Link
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

24. RIP Timers: What is an invalid Timer?
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.
Segments
120

25. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
60
Presentation

26. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
1 - everything hooked to the hub is in the same collision domain
62 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
60

27. What Layer does CDP operate at?
Pins 1+2 swap places with pins 3+6
DCE
Layer 2
D

28. What is Layer 7 in the OSI Model?
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
2 - each port is it's own collision domain
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Application

29. 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
255.255.255.128
Query and other router responds with a REPLY packet.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

30. 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
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
120

31. RIP Timers: What is an Holddown Timer?
/9
Switch forwards frame once it completely receives it
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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

32. Subnetting: What is a 255.128.0.0 in prefix notation
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Switch forwards the frame as soon as it can
/9
Show ip eigrp topology

33. What is Layer 2 in the OSI Model?
120
Data-Link
1-65535
Application

34. Command for a static route with 'Next Hop' Address
Every 128 ip's
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.
Session
Router(config)#ip route {network address} {subnet-mask}

35. What is Layer 3 in the OSI Model?
Pins 1+2 swap places with pins 3+6
Network
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.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
14 per network
2 hosts
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

37. Using the magic number how to you figure the broadcast?
Session
IEEE 802.3u
/9
Add the magic number to the network minus 1

38. What is the boot sequence for Cisco Routers?
Packets
Pins 1+2 swap places with pins 3+6
R3(config)#router rip - R3(config-router)#network 192.168.1.2
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

39. IEEE Standards: Ethernet
R
IEEE 802.3
Switch forwards frame once it completely receives it
Every 8 ip's

40. Subnetting: What is a 255.255.255.0 in prefix notation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
IEEE 802.3ab
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
/24

41. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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)#ip route {exit-interface}
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Switch forwards the frame as soon as it can

42. What is the Transport PDU called?
Hop Count
Segments
Every 4 ip's
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

43. Rip Timers: How long is the default for Flush timer.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Pins 1+2 swap places with pins 3+6
60
Segments

44. OSPF: What is the default administrative distance?
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
110
Packets

45. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Layer 2
Switch forwards frame once it completely receives it
DUAL: Difusing Update Algorithm

46. Subnetting: What is a 255.255.252.0 in prefix notation
/22
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)#
255.255.0.0
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

47. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
110
IEEE 802.3
Hop Count

48. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
255.255.255.224
D
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

49. Subnetting: What is a 255.255.255.240 in prefix notation
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
/28
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
IEEE 802.3u

50. Rip: What causes a triggered update?
Segments
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
2 - each port is it's own collision domain
/24