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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. CABLES: What is the T568A Pinout Standard?
Show ip eigrp topology
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Session
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

2. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
D
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 hosts
120

3. What is the boot sequence for Cisco Routers?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Bandwidth - Delay - reliability and Load
Every 8 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

4. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
IEEE 802.3u
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
R3(config)#router rip - R3(config-router)#network 192.168.1.2

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

6. What is the Data-Link PDU called?
126 per network
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
Frames

7. What is the Transport PDU called?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 64 ip's
Segments
DCE

8. What is the layer 3 PDU called?
1 - everything hooked to the hub is in the same collision domain
Segments
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Packets

9. Rip: What causes a triggered update?
255.255.0.0
Every 16 ip's
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.

10. Subnetting: What is a /16 in Decimal
Closest multiple of the magic number that is not over the interesting octets number.
1 - everything hooked to the hub is in the same collision domain
Packets
255.255.0.0

11. What gets the clock rate - DCE or DTE?
Hop Count
Layer 2
DCE
255.255.255.128

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

13. IEEE Standards: Gibabit Ethernet (Fibre)
Frames
Frames
IEEE 802.3z
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

14. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Periodic Updates of their routing table
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3z

15. RIP: What is the default Administrative Distance?
62 per network
Segments
100
120

16. What is the metric for RIP
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
110
Hop Count
IEEE 802.3

17. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
IEEE 802.3z

18. Command for a static route with exit interface
255.255.255.128
Router(config)#ip route {exit-interface}
Packets
Every 4 ip's

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Closest multiple of the magic number that is not over the interesting octets number.
30 per network
255.255.255.128
255.255.255.252

20. What are the commands to setup SSH?
180 seconds
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
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)#

21. IEEE Standards: Fast Ethernet
IEEE 802.3u
Every 16 ip's
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
255.255.255.128

22. Using the magic number how to you figure the broadcast?
62 per network
120
Add the magic number to the network minus 1
Every 128 ip's

23. Switching Methods: What is Fragment-free?
Show ip eigrp topology
Periodic Updates of their routing table
126 per network
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

24. What is the layer 4 PDU called?
Frames
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Segments

25. 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
30 per network
Router(config)#ip route {network address} {subnet-mask}
14 per network

26. How many Collision domains are there on a with 1 hub and 2 computers?
Every 32 ip's
180
1 - everything hooked to the hub is in the same collision domain
126 per network

27. EIGRP: How do you view if there are any successor routes?
Every 4 ip's
Show ip eigrp topology
Every 16 ip's
Physical

28. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
DUAL: Difusing Update Algorithm
62 per network
Add the magic number to the network minus 1

29. Rip: Command to prevent rip updates on an interface
Hop Count
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

30. CABLES: What is the difference between T568A and T568B?
126 per network
100
Pins 1+2 swap places with pins 3+6
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

31. What is Layer 7 in the OSI Model?
Application
62 per network
Segments
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

32. Subnetting: What is a 255.128.0.0 in prefix notation
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3z
/9
Shortest path first - (SPF)

33. Switching Methods: What is Cut-through?
/9
Switch forwards the frame as soon as it can
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
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

34. RIP: What Algorithm is used in RIP>
Frames
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
D
Bellman-Ford

35. Subnetting: What is a /30 in Decimal
100
255.255.255.252
2 hosts
Frames

36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
180 seconds
14 per network
1-65535
Shortest path first - (SPF)

37. Subnetting: What is a /25 in Decimal
/28
110
14 per network
255.255.255.128

38. Rip: how do hold down timers work?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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
255.255.192.0
2 hosts

39. What is Layer 6 in the OSI Model?
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3ab
Presentation
Every 4 ip's

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

41. EIGRP: What packet is used to search for networks?
2 hosts
Query and other router responds with a REPLY packet.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

42. What is the Network PDU called?
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)#
Data-Link
14 per network
Packets

43. Symbol for EIGRP on a Show ip route
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Transport
Every 128 ip's
D

44. What is Layer 3 in the OSI Model?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Network
DCE

45. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Router(config)#ip route {exit-interface}
Switch forwards the frame as soon as it can
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

46. CABLES: What is the T568B Pinout Standard?
DCE
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Frames
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

47. Subnetting: What is a 255.255.252.0 in prefix notation
Session
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
/22
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

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

49. What are the comands to set the clock rate in a serial connection?
Hop Count
IEEE 802.3z
255.255.255.252
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

50. RIP Timers: What is an invalid Timer?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.0.0
/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.