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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. Rip: What does v2 have that v1 does not?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Pins 1+2 swap places with pins 3+6
120

2. Command for a static route with 'Next Hop' Address
DUAL: Difusing Update Algorithm
Router(config)#ip route {network address} {subnet-mask}
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
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.

3. Subnetting: What is a 255.255.255.240 in prefix notation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Closest multiple of the magic number that is not over the interesting octets number.
60
/28

4. What is Layer 2 in the OSI Model?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Data-Link
R1(config)#router rip - R1(config-router)#version 2
Every 4 ip's

5. What is the boot sequence for Cisco Routers?
Presentation
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#router rip - R1(config-router)#version 2

6. Subnetting: What is a 255.255.252.0 in prefix notation
/22
R1(config)#router rip - R1(config-router)#version 2
Transport
Query and other router responds with a REPLY packet.

7. What gets the clock rate - DCE or DTE?
DCE
100
Packets
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

8. Rip: What is the command to enable Ripv2?
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
Pins 1+2 swap places with pins 3+6
Periodic Updates of their routing table
R1(config)#router rip - R1(config-router)#version 2

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

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10. Rip Timers: How long is the default for Invalid timer.
/22
DUAL: Difusing Update Algorithm
Segments
180 seconds

11. Symbol for EIGRP on a Show ip route
1 - everything hooked to the hub is in the same collision domain
D
180 seconds
180

12. What is the layer 2 PDU called?
1 - everything hooked to the hub is in the same collision domain
DCE
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

13. How many Collision domains are there on a with 1 hub and 2 computers?
255.255.192.0
1 - everything hooked to the hub is in the same collision domain
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3z

14. What is Layer 6 in the OSI Model?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 4 ip's
Presentation
R1(config)#router rip - R1(config-router)#version 2

15. Rip Timers: How long is the default for Flush timer.
Closest multiple of the magic number that is not over the interesting octets number.
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
60

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

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17. What is Layer 7 in the OSI Model?
Frames
Application
IEEE 802.3z
14 per network

18. Subnetting: What is a /25 in Decimal
255.255.255.128
Packets
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
14 per network

19. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 64 ip's
Network
Every 32 ip's

20. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
IEEE 802.3u
126 per network

21. RIP Timers: What is an Holddown Timer?
Show ip eigrp topology
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
2 - the bridge separates the collision domain
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

22. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
/28
255.255.192.0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

23. IEEE Standards: Ethernet
Router(config)#ip route {network address} {subnet-mask}
Every 8 ip's
IEEE 802.3
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. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.255.224
/24
180 seconds

25. Name the TCP/IP Layers
Segments
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
/22

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

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27. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
255.255.255.252
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Every 16 ip's

28. Rip: What causes a triggered update?
/22
Periodic Updates of their routing table
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/28

29. Switching Methods: What is Store and Forward?
1-65535
/24
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
Switch forwards frame once it completely receives it

30. Subnetting: What is a 255.128.0.0 in prefix notation
Segments
Frames
Every 32 ip's
/9

31. What Layer does CDP operate at?
2 - each port is it's own collision domain
IEEE 802.3u
Layer 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.

32. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
DCE
Transport
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

33. What is the layer 3 PDU called?
1 - everything hooked to the hub is in the same collision domain
Switch forwards the frame as soon as it can
Packets
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

34. OSPF: What is the process used by OSPF to build a routing table (step by step)
Switch forwards frame once it completely receives it
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 64 ip's
Frames

35. OSPF: What Algorithm is used?
/24
Transport
IEEE 802.3
Shortest path first - (SPF)

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

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37. What is the Network PDU called?
Presentation
Packets
255.255.255.224
Frames

38. IEEE Standards: Fast Ethernet
Application
Pins 1+2 swap places with pins 3+6
IEEE 802.3u
Bandwidth - Delay - reliability and Load

39. What is the metric for RIP
R1(config)#router rip - R1(config-router)#version 2
Bandwidth - Delay - reliability and Load
255.255.255.252
Hop Count

40. EIGRP: What packet is used to search for networks?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
2 - the bridge separates the collision domain
R
Query and other router responds with a REPLY packet.

41. What is Layer 4 in the OSI Model?
62 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)#ip route {network address} {subnet-mask}
Transport

42. What is the layer 4 PDU called?
Segments
D
255.255.192.0
1 - everything hooked to the hub is in the same collision domain

43. CABLES: What is the T568B Pinout Standard?
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:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Bellman-Ford
DCE

44. Rip Timers: How long is the default for Holddown timer.
DCE
Every 4 ip's
Hop Count
180

45. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Segments
Every 16 ip's
2 hosts

46. What are the commands to setup SSH?
14 per network
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)#
255.255.255.128
Query and other router responds with a REPLY packet.

47. What is Layer 5 in the OSI Model?
Session
R1(config)#router rip - R1(config-router)#version 2
Every 32 ip's
DCE

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

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49. Using the magic number how to you figure the broadcast?
Packets
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Add the magic number to the network minus 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

50. EIGRP: What packet is used to propagate routing information?
Packets
Pins 1+2 swap places with pins 3+6
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