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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 hello packet used for?
Router(config)#ip route {exit-interface}
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

2. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3
IEEE 802.3z
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

3. Command for a static route with 'Next Hop' Address
100
Router(config)#ip route {network address} {subnet-mask}
60
D

4. OSPF: What Algorithm is used?
1-65535
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Shortest path first - (SPF)
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

5. What is the layer 2 PDU called?
Router(config)#ip route {exit-interface}
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.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

6. Name the TCP/IP Layers
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
/24
DUAL: Difusing Update Algorithm

7. What is Layer 1 in the OSI Model?
/22
30 per network
Physical
255.255.192.0

8. Subnetting: What is a /18 in Decimal
62 per network
Every 8 ip's
255.255.192.0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

9. 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.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames
255.255.255.224

10. Rip and EIGRP use what to keep other routers aware of their status?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1 - everything hooked to the hub is in the same collision domain
Periodic Updates of their routing table
30 per network

11. EIGRP: What packet is used to propagate routing information?
/24
Segments
Pins 1+2 swap places with pins 3+6
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

12. Symbol for Rip on a Show ip route
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
/9
Packets
R

13. Subnetting: What is a 255.255.255.240 in prefix notation
Closest multiple of the magic number that is not over the interesting octets number.
Network
Bandwidth - Delay - reliability and Load
/28

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

15. RIP Timers: What is an Flush Timer?
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.
R1(config)#router rip - R1(config-router)#version 2
2 - the bridge separates the collision domain
180

16. IEEE Standards: Fast Ethernet
126 per network
IEEE 802.3u
100
Session

17. What are the commands to setup SSH?
100
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)#
Router(config)#ip route {exit-interface}
110

18. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Session
/9
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

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

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

21. EIGRP: What is the range of Autonomous System numbers?
1-65535
IEEE 802.3z
DUAL: Difusing Update Algorithm
Layer 2

22. Rip: Command to prevent rip updates on an interface
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
D
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

23. What is the metric for RIP
126 per network
1 - everything hooked to the hub is in the same collision domain
/22
Hop Count

24. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Layer 2
Switch forwards frame once it completely receives it
2 - the bridge separates the collision domain
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

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

26. IEEE Standards: Ethernet
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3
/9

27. OSPF: What does OSPF use for its metric?
60
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
30 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

28. RIP: What Algorithm is used in RIP>
Closest multiple of the magic number that is not over the interesting octets number.
Presentation
100
Bellman-Ford

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

30. What is Layer 7 in the OSI Model?
IEEE 802.3
180 seconds
Application
Packets

31. EIGRP: What is the default administrative distance?
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)#
100
255.255.255.252
Every 32 ip's

32. What is the layer 3 PDU called?
120
Switch forwards the frame as soon as it can
Packets
IEEE 802.3z

33. Rip: What is the command to enable Ripv2?
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
R1(config)#router rip - R1(config-router)#version 2
Every 128 ip's
Periodic Updates of their routing table

34. OSPF: how do you change the cost of an interface for OSPF?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
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
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

35. What is the Network PDU called?
Show ip eigrp topology
Packets
Query and other router responds with a REPLY packet.
2 - each port is it's own collision domain

36. How do you find the magic number for subnetting?
180
IEEE 802.3u
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Transport

37. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3u
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
14 per network

38. What Layer does CDP operate at?
120
Every 4 ip's
/24
Layer 2

39. CABLES: What is the T568A Pinout Standard?
IEEE 802.3ab
2 hosts
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
180 seconds

40. What is the metric for EIGRP
/22
IEEE 802.3z
14 per network
Bandwidth - Delay - reliability and Load

41. What is the boot sequence for Cisco Routers?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Layer 2
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

42. EIGRP: What packet is used to search for networks?
255.255.255.224
Query and other router responds with a REPLY packet.
120
Shortest path first - (SPF)

43. 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
110
Frames
60

44. Rip Timers: How long is the default for Holddown timer.
2 - each port is it's own collision domain
180
14 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

45. What is Layer 2 in the OSI Model?
Data-Link
120
Router(config)#ip route {network address} {subnet-mask}
Query and other router responds with a REPLY packet.

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

47. Subnetting: What is a /30 in Decimal
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Router(config)#ip route {network address} {subnet-mask}
255.255.255.252
Bandwidth - Delay - reliability and Load

48. Symbol for EIGRP on a Show ip route
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
D
Bandwidth - Delay - reliability and Load
Transport

49. What are the comands to set the clock rate in a serial connection?
110
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Transport
Periodic Updates of their routing table

50. Subnetting: What is a /27 in Decimal
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
255.255.255.224
2 - the bridge separates the collision domain