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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 2 in the OSI Model?
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)#
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)#router rip - R1(config-router)#version 2
Data-Link

2. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Data-Link
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Hop Count
1-65535

3. IEEE Standards: Gibabit Ethernet (Copper)
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
IEEE 802.3ab
2 - each port is it's own collision domain
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

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

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5. Subnetting: What is a /18 in Decimal
Segments
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.192.0
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

6. 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
Network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
100

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

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8. CABLES: What is the T568A Pinout Standard?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Network
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Pins 1+2 swap places with pins 3+6

9. EIGRP: What is the default administrative distance?
255.255.0.0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
100

10. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.0.0
Frames
1 - everything hooked to the hub is in the same collision domain

11. OSPF: What Algorithm is used?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Shortest path first - (SPF)
60

12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
126 per network
/22
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
30 per network

13. What is the layer 3 PDU called?
Packets
14 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
IEEE 802.3u

14. RIP Timers: What is an Flush Timer?
IEEE 802.3u
Physical
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
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.

15. RIP: What Algorithm is used in RIP>
Bellman-Ford
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Network
Application

16. 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
1-65535
Switch forwards frame once it completely receives it
Packets

17. What is Layer 4 in the OSI Model?
Transport
180 seconds
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

18. 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
Show ip eigrp topology
Bellman-Ford

19. Subnetting: What is a /25 in Decimal
Segments
180 seconds
255.255.255.128
Periodic Updates of their routing table

20. EIGRP: What is the name of the algorithm used for EIGRP?
2 hosts
255.255.255.252
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
DUAL: Difusing Update Algorithm

21. What is the layer 2 PDU called?
Frames
Every 16 ip's
Bandwidth - Delay - reliability and Load
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

22. Subnetting: What is a 255.255.255.240 in prefix notation
Transport
Bellman-Ford
/9
/28

23. Rip: What causes a triggered update?
Hop Count
Network
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

24. What is the metric for EIGRP
IEEE 802.3z
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Bandwidth - Delay - reliability and Load
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. What is the Data-Link PDU called?
255.255.192.0
Shortest path first - (SPF)
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

26. What is the metric for RIP
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Hop Count
Every 16 ip's
180

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

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28. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.
2 - the bridge separates the collision domain
/28
126 per network

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

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30. CABLES: What is the T568B Pinout Standard?
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
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.
R
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

31. Rip: What is the command to enable Ripv2?
Every 8 ip's
Shortest path first - (SPF)
R1(config)#router rip - R1(config-router)#version 2
/9

32. RIP Timers: What is an invalid Timer?
60
Every 64 ip's
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.
Every 4 ip's

33. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
Periodic Updates of their routing table
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Query and other router responds with a REPLY packet.

34. What gets the clock rate - DCE or DTE?
DCE
/22
180
/24

35. Rip Timers: How long is the default for Invalid timer.
Transport
180 seconds
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

36. EIGRP: What packet is used to propagate routing information?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

37. Rip Timers: How long is the default for Flush timer.
Switch forwards frame once it completely receives it
60
Periodic Updates of their routing table
1 - everything hooked to the hub is in the same collision domain

38. Switching Methods: What is Fragment-free?
Every 8 ip's
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
180
30 per network

39. IEEE Standards: Fast Ethernet
IEEE 802.3u
62 per network
Every 64 ip's
2 - the bridge separates the collision domain

40. What is the boot sequence for Cisco Routers?
Periodic Updates of their routing table
/28
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
DUAL: Difusing Update Algorithm

41. What is Layer 5 in the OSI Model?
Session
Data-Link
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

42. CABLES: What is the difference between T568A and T568B?
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
255.255.255.224
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

43. How many Collision domains are there on a with 1 hub and 2 computers?
255.255.255.252
1 - everything hooked to the hub is in the same collision domain
110
Router(config)#ip route {network address} {subnet-mask}

44. Symbol for EIGRP on a Show ip route
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
D
30 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

45. What is the Network PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Packets
255.255.255.128
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

46. Subnetting: What is a 255.255.255.0 in prefix notation
/24
Show ip eigrp topology
Frames
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. What are the comands to set the clock rate in a serial connection?
110
Layer 2
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Application

48. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Layer 2
Pins 1+2 swap places with pins 3+6
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

49. Subnetting: What is a /27 in Decimal
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)#
255.255.255.224
Router(config)#ip route {network address} {subnet-mask}
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

50. EIGRP: What is the range of Autonomous System numbers?
1-65535
Router(config)#ip route {network address} {subnet-mask}
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)#
/24