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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. IEEE Standards: Gibabit Ethernet (Fibre)
255.255.0.0
IEEE 802.3z
Network
Pins 1+2 swap places with pins 3+6

2. Subnetting: What is a 255.255.255.240 in prefix notation
D
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/28
/22

3. RIP Timers: What is an invalid Timer?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
255.255.255.128
Packets
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.

4. RIP Timers: What is an Holddown Timer?
IEEE 802.3ab
14 per network
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
60

5. Command for a static route with exit interface
Session
255.255.0.0
Router(config)#ip route {exit-interface}
Every 4 ip's

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

7. CABLES: What is the T568A Pinout Standard?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
IEEE 802.3ab
Bandwidth - Delay - reliability and Load

8. 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
Bandwidth - Delay - reliability and Load
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

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

10. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Periodic Updates of their routing table
255.255.0.0

11. Subnetting: What is a /30 in Decimal
Periodic Updates of their routing table
255.255.255.252
60
D

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

13. Rip: how do hold down timers work?
2 - the bridge separates the collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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

14. What is Layer 1 in the OSI Model?
100
Physical
Router(config)#ip route {network address} {subnet-mask}
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

15. How many Collision domains are there on a with 1 hub and 2 computers?
1 - everything hooked to the hub is in the same collision domain
Application
Router(config)#ip route {exit-interface}
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

16. Subnetting: What is a /16 in Decimal
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
120
255.255.0.0
14 per network

17. What Layer does CDP operate at?
Show ip eigrp topology
Layer 2
Physical
2 - each port is it's own collision domain

18. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Every 16 ip's
/22
D

19. CABLES: What is the T568B Pinout Standard?
Transport
1 - everything hooked to the hub is in the same collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Closest multiple of the magic number that is not over the interesting octets number.

20. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Frames
1-65535
R3(config)#router rip - R3(config-router)#network 192.168.1.2

21. What is Layer 7 in the OSI Model?
Application
Show ip eigrp topology
Periodic Updates of their routing table
Segments

22. What is Layer 6 in the OSI Model?
Presentation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
R
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

23. OSPF: how do you change the cost of an interface for OSPF?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
IEEE 802.3ab
/22
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

24. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
Transport
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Add the magic number to the network minus 1

25. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1-65535
D

26. RIP: What Algorithm is used in RIP>
Frames
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Bellman-Ford

27. OSPF: What Algorithm is used?
60
Shortest path first - (SPF)
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

28. EIGRP: What packet is used to search for networks?
Every 8 ip's
Query and other router responds with a REPLY packet.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
/22

29. 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
R1(config)#router rip - R1(config-router)#version 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Transport

30. Symbol for EIGRP on a Show ip route
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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.
Show ip eigrp topology
D

31. EIGRP: What is the default administrative distance?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
100
/28
Every 32 ip's

32. What is the layer 3 PDU called?
2 - each port is it's own collision domain
Packets
/9
Router(config)#ip route {exit-interface}

33. What is Layer 5 in the OSI Model?
126 per network
Every 16 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Session

34. What is the layer 4 PDU called?
Every 16 ip's
Show ip eigrp topology
Layer 2
Segments

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

36. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Layer 2
IEEE 802.3z
Every 32 ip's

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

38. What is the Data-Link PDU called?
120
30 per network
Frames
Presentation

39. 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
Bandwidth - Delay - reliability and Load
255.255.255.252
Presentation

40. What is Layer 3 in the OSI Model?
Network
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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

41. What gets the clock rate - DCE or DTE?
120
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
DCE
180

42. Subnetting: What is a /25 in Decimal
IEEE 802.3
Router(config)#ip route {exit-interface}
255.255.255.128
Segments

43. Subnetting: What is a 255.128.0.0 in prefix notation
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
126 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)#
/9

44. What is the Network PDU called?
Switch forwards the frame as soon as it can
Packets
DUAL: Difusing Update Algorithm
Frames

45. EIGRP: How do you view if there are any successor routes?
Switch forwards frame once it completely receives it
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)#
Every 8 ip's
Show ip eigrp topology

46. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
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.
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.

47. Symbol for Rip on a Show ip route
R
/28
126 per network
D

48. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Segments
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/24

49. What are the commands to setup SSH?
Layer 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)#
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3u

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