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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. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
/22
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

2. EIGRP: What packet is used to search for networks?
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.
Packets
Packets

3. EIGRP: What packet is used to propagate routing information?
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
Shortest path first - (SPF)
R1(config)#router rip - R1(config-router)#version 2

4. IEEE Standards: Ethernet
D
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
IEEE 802.3
Closest multiple of the magic number that is not over the interesting octets number.

5. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
R1(config)#router rip - R1(config-router)#version 2
Shortest path first - (SPF)
IEEE 802.3u

6. How many Collision domains are there on a with 1 hub and 2 computers?
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
1 - everything hooked to the hub is in the same collision domain
/9
100

7. What is the layer 3 PDU called?
255.255.255.252
Frames
120
Packets

8. What is the Network PDU called?
Packets
255.255.192.0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

9. Rip Timers: How long is the default for Holddown timer.
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Switch forwards the frame as soon as it can
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
180

10. Rip: What does v2 have that v1 does not?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Layer 2
Frames
Data-Link

11. OSPF: What Algorithm is used?
110
/22
Switch forwards the frame as soon as it can
Shortest path first - (SPF)

12. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Query and other router responds with a REPLY packet.
R1(config)#router rip - R1(config-router)#version 2
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)#

13. What is Layer 4 in the OSI Model?
Frames
Transport
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

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

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15. What is Layer 7 in the OSI Model?
1-65535
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Application

16. Symbol for EIGRP on a Show ip route
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
D
Session

17. RIP: What is the default Administrative Distance?
/28
Network
120
DCE

18. CABLES: What is the T568B Pinout Standard?
255.255.255.128
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
IEEE 802.3ab
180

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

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20. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Presentation
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3ab

21. Subnetting: What is a /27 in Decimal
62 per network
Hop Count
R1(config)#router rip - R1(config-router)#version 2
255.255.255.224

22. Command for a static route with 'Next Hop' Address
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Data-Link
Router(config)#ip route {network address} {subnet-mask}

23. CABLES: What is the difference between T568A and T568B?
126 per network
Every 8 ip's
Data-Link
Pins 1+2 swap places with pins 3+6

24. What Layer does CDP operate at?
Layer 2
14 per network
DCE
Transport

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
Every 32 ip's
100
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

26. Rip: What is the command to enable Ripv2?
Network
Every 8 ip's
60
R1(config)#router rip - R1(config-router)#version 2

27. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
30 per network
126 per network
Packets
Add the magic number to the network minus 1

28. What is Layer 2 in the OSI Model?
Data-Link
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.
DCE
Every 8 ip's

29. Rip: Command to prevent rip updates on an interface
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

30. RIP Timers: What is an Flush Timer?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
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.
IEEE 802.3u

31. What is the metric for RIP
30 per network
Hop Count
Every 32 ip's
/22

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Session
Network
14 per network

33. OSPF: What does OSPF use for its metric?
(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
Every 8 ip's
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

34. Subnetting: What is a 255.255.255.240 in prefix notation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
D
Presentation
/28

35. Subnetting: What is a 255.128.0.0 in prefix notation
/9
Shortest path first - (SPF)
Bandwidth - Delay - reliability and Load
120

36. EIGRP: What is the hello packet used for?
Every 64 ip's
Packets
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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)#

37. Subnetting: What is a /25 in Decimal
1 - everything hooked to the hub is in the same collision domain
255.255.255.128
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

38. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
60
30 per network
Data-Link
Every 32 ip's

39. Command for a static route with exit interface
Physical
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Router(config)#ip route {exit-interface}
R

40. What is Layer 1 in the OSI Model?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Physical
Frames
Packets

41. 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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
IEEE 802.3z
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

42. What gets the clock rate - DCE or DTE?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
DCE
Router(config)#ip route {network address} {subnet-mask}
DUAL: Difusing Update Algorithm

43. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Every 64 ip's
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Session

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

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45. RIP: What Algorithm is used in RIP>
Every 64 ip's
180
255.255.0.0
Bellman-Ford

46. IEEE Standards: Gibabit Ethernet (Fibre)
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.
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3z

47. IEEE Standards: Gibabit Ethernet (Copper)
DUAL: Difusing Update Algorithm
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
IEEE 802.3ab
Network

48. What are the commands to setup SSH?
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)#
120
2 hosts
Bellman-Ford

49. Rip Timers: How long is the default for Invalid timer.
Segments
180 seconds
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
120

50. What is Layer 5 in the OSI Model?
/28
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.
100
Session