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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 4 in the OSI Model?
Data-Link
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Transport
IEEE 802.3

2. What is the Data-Link PDU called?
Every 16 ip's
Router(config)#ip route {network address} {subnet-mask}
Frames
14 per network

3. Name the TCP/IP Layers
IEEE 802.3ab
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.0.0

4. What is the metric for RIP
Hop Count
Presentation
R
Segments

5. What are the commands to setup SSH?
Packets
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)#
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
/24

6. Symbol for Rip on a Show ip route
/28
R
Every 128 ip's
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

7. RIP: What Algorithm is used in RIP>
/22
Switch forwards frame once it completely receives it
Bellman-Ford
Periodic Updates of their routing table

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

9. OSPF: What does OSPF use for its metric?
Presentation
255.255.0.0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

10. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
180 seconds
/9
/24

11. Subnetting: What is a 255.255.255.0 in prefix notation
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/24

12. Subnetting: What is a 255.255.255.240 in prefix notation
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 4 ip's
IEEE 802.3u
/28

13. RIP Timers: What is an Flush Timer?
IEEE 802.3u
/28
IEEE 802.3
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.

14. Name the OSI Layers
Segments
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
R1(config)#router rip - R1(config-router)#version 2
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

15. RIP Timers: What is an invalid Timer?
62 per network
Every 4 ip's
Hop Count
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.

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

17. Subnetting: What is a /30 in Decimal
Hop Count
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.
255.255.255.252
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

18. What Layer does CDP operate at?
Application
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Layer 2
Frames

19. 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
Transport
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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)#

20. Rip: What does v2 have that v1 does not?
Every 64 ip's
255.255.255.252
14 per network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

21. RIP Timers: What is an Holddown Timer?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Router(config)#ip route {exit-interface}
62 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

22. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
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.
/22
Presentation

23. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Every 8 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Closest multiple of the magic number that is not over the interesting octets number.

24. 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
Closest multiple of the magic number that is not over the interesting octets number.
R3(config)#router rip - R3(config-router)#network 192.168.1.2
62 per network

25. What is Layer 7 in the OSI Model?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.255.224
2 hosts
Application

26. What is Layer 1 in the OSI Model?
Query and other router responds with a REPLY packet.
IEEE 802.3u
Physical
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

27. What gets the clock rate - DCE or DTE?
DCE
IEEE 802.3u
Hop Count
120

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

29. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
R3(config)#router rip - R3(config-router)#network 192.168.1.2
1 - everything hooked to the hub is in the same collision domain
180

30. What is the layer 4 PDU called?
60
Segments
Closest multiple of the magic number that is not over the interesting octets number.
Physical

31. Rip: What causes a triggered update?
Packets
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1 - everything hooked to the hub is in the same collision domain

32. Rip Timers: How long is the default for Flush timer.
Physical
60
Switch forwards the frame as soon as it can
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

33. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
Bellman-Ford
Periodic Updates of their routing table
/9

34. Switching Methods: What is Cut-through?
Every 8 ip's
30 per network
Switch forwards the frame as soon as it can
Packets

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
255.255.255.128
Router(config)#ip route {network address} {subnet-mask}
Every 128 ip's

36. Symbol for EIGRP on a Show ip route
2 - each port is it's own collision domain
D
Packets
DCE

37. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
110
Presentation
Router(config)#ip route {exit-interface}

38. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Add the magic number to the network minus 1
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.

39. How many Collision domains are there on a with 1 hub and 2 computers?
Router(config)#ip route {network address} {subnet-mask}
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1 - everything hooked to the hub is in the same collision domain
Every 8 ip's

40. IEEE Standards: Gibabit Ethernet (Fibre)
Add the magic number to the network minus 1
IEEE 802.3z
2 - each port is it's own collision domain
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

41. What is the layer 3 PDU called?
Packets
62 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Show ip eigrp topology

42. 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
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Segments
255.255.0.0

43. What is the layer 2 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
DCE
IEEE 802.3z
Frames

44. OSPF: What is the default administrative distance?
120
110
180 seconds
Every 8 ip's

45. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
R1(config)#router rip - R1(config-router)#version 2
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Shortest path first - (SPF)

46. What is the Transport PDU called?
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.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments

47. Subnetting: What is a 255.255.252.0 in prefix notation
/22
Packets
Every 8 ip's
Pins 1+2 swap places with pins 3+6

48. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
IEEE 802.3
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/28
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

49. EIGRP: What is the name of the algorithm used for EIGRP?
1 - everything hooked to the hub is in the same collision domain
Frames
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)#
DUAL: Difusing Update Algorithm

50. IEEE Standards: Fast Ethernet
IEEE 802.3u
/22
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.
255.255.255.224