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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 (Copper)
Query and other router responds with a REPLY packet.
Every 8 ip's
IEEE 802.3
IEEE 802.3ab

2. Rip: What causes a triggered update?
Switch forwards the frame as soon as it can
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
255.255.0.0
Every 32 ip's

3. IEEE Standards: Gibabit Ethernet (Fibre)
Hop Count
1-65535
IEEE 802.3z
/22

4. IEEE Standards: Fast Ethernet
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)#
IEEE 802.3u
Bandwidth - Delay - reliability and Load
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

5. Rip: What does v2 have that v1 does not?
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
180 seconds

6. RIP Timers: What is an Holddown Timer?
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
Segments
180 seconds
180

7. 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
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

8. What is the layer 3 PDU called?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets
Hop Count
R1(config)#router rip - R1(config-router)#version 2

9. How do you find the magic number for subnetting?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Session
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

10. Command for a static route with exit interface
R1(config)#router rip - R1(config-router)#version 2
Every 16 ip's
Router(config)#ip route {exit-interface}
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

11. What are the comands to set the clock rate in a serial connection?
D
Every 4 ip's
60
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

12. OSPF: What is the default administrative distance?
110
120
30 per network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

13. Name the TCP/IP Layers
255.255.255.252
Pins 1+2 swap places with pins 3+6
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R3(config)#router rip - R3(config-router)#network 192.168.1.2

14. What Layer does CDP operate at?
120
/28
Layer 2
Every 4 ip's

15. What is the metric for RIP
14 per network
Hop Count
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

16. Subnetting: What is a /27 in Decimal
255.255.255.224
/24
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
IEEE 802.3z

17. RIP: What is the default Administrative Distance?
120
Router(config)#ip route {exit-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
2 - the bridge separates the collision domain

18. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
14 per network
2 - each port is it's own collision domain
255.255.255.224

19. What gets the clock rate - DCE or DTE?
Every 8 ip's
DCE
/22
Every 4 ip's

20. What are the commands to setup SSH?
IEEE 802.3u
/28
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)#
Router(config)#ip route {network address} {subnet-mask}

21. What is Layer 1 in the OSI Model?
Query and other router responds with a REPLY packet.
Physical
120
Presentation

22. What is Layer 7 in the OSI Model?
255.255.192.0
110
Application
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.

23. What is the layer 4 PDU called?
255.255.0.0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Segments
Switch forwards the frame as soon as it can

24. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Network
100
2 - the bridge separates the collision domain
R

25. Rip: how do hold down timers work?
Packets
Frames
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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

26. Rip: Command to prevent rip updates on an interface
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

27. Subnetting: What is a 255.128.0.0 in prefix notation
/9
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)#
110
DUAL: Difusing Update Algorithm

28. Symbol for Rip on a Show ip route
2 - each port is it's own collision domain
Physical
R
/9

29. EIGRP: What is the default administrative distance?
255.255.255.252
100
IEEE 802.3ab
Every 4 ip's

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

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31. What is the Transport PDU called?
Segments
Layer 2
/22
IEEE 802.3ab

32. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Bandwidth - Delay - reliability and Load
Switch forwards the frame as soon as it can
IEEE 802.3ab

33. Subnetting: What is a 255.255.255.240 in prefix notation
Session
/28
255.255.255.224
Every 8 ip's

34. EIGRP: What packet is used to search for networks?
IEEE 802.3ab
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/24
Query and other router responds with a REPLY packet.

35. What is the Network PDU called?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Packets
255.255.192.0
Network

36. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
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
Network

37. What is the Data-Link PDU called?
Shortest path first - (SPF)
Frames
255.255.255.224
IEEE 802.3z

38. Command for a static route with 'Next Hop' Address
Session
1-65535
Router(config)#ip route {network address} {subnet-mask}
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

39. OSPF: What does OSPF use for its metric?
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.
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
120
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

40. 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
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)#
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
180

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

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

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43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
/28
Every 64 ip's
126 per network
R1(config)#router rip - R1(config-router)#version 2

44. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
2 - the bridge separates the collision domain
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

45. Switching Methods: What is Cut-through?
DUAL: Difusing Update Algorithm
110
Router(config)#ip route {exit-interface}
Switch forwards the frame as soon as it can

46. Symbol for EIGRP on a Show ip route
Physical
180 seconds
D
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

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

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48. OSPF: What Algorithm is used?
IEEE 802.3ab
Shortest path first - (SPF)
IEEE 802.3u
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

49. Rip Timers: How long is the default for Flush timer.
60
Every 64 ip's
Segments
Bellman-Ford

50. EIGRP: How do you view if there are any successor routes?
110
Packets
Show ip eigrp topology
Transport