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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. Command for a static route with exit interface
Bandwidth - Delay - reliability and Load
Router(config)#ip route {exit-interface}
Layer 2
Physical

2. What is Layer 2 in the OSI Model?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Data-Link
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
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.

3. Symbol for Rip on a Show ip route
100
Every 8 ip's
Packets
R

4. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Every 64 ip's
2 - each port is it's own collision domain
110

5. Rip Timers: How long is the default for Flush 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
2 - the bridge separates the collision domain
Pins 1+2 swap places with pins 3+6
60

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

7. EIGRP: What is the range of Autonomous System numbers?
Frames
1-65535
Presentation
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)#

8. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
100
Router(config)#ip route {exit-interface}
2 hosts
30 per network

9. IEEE Standards: Gibabit Ethernet (Copper)
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3ab
DCE
Hop Count

10. EIGRP: What is the hello packet used for?
Every 4 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 8 ip's

11. How many Collision domains are there on a with 1 hub and 2 computers?
Every 16 ip's
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
IEEE 802.3z
1 - everything hooked to the hub is in the same collision domain

12. What is the layer 4 PDU called?
/24
Session
Packets
Segments

13. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
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
R3(config)#router rip - R3(config-router)#network 192.168.1.2
14 per network
255.255.255.128

14. OSPF: What is the process used by OSPF to build a routing table (step by step)
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 16 ip's
255.255.255.224

15. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
120
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R3(config)#router rip - R3(config-router)#network 192.168.1.2
D

16. What is Layer 7 in the OSI Model?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3z
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Application

17. EIGRP: What packet is used to propagate routing information?
Every 32 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
110

18. OSPF: What is the default administrative distance?
Show ip eigrp topology
255.255.192.0
110
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

19. Subnetting: What is a /30 in Decimal
255.255.255.252
1-65535
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

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

21. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Every 8 ip's
180
14 per network

22. EIGRP: What is the default administrative distance?
100
Bellman-Ford
Add the magic number to the network minus 1
IEEE 802.3u

23. 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
62 per network
110
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

24. What is the metric for EIGRP
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Bandwidth - Delay - reliability and Load
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)#
Pins 1+2 swap places with pins 3+6

25. Subnetting: What is a /25 in Decimal
255.255.255.128
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Segments

26. What gets the clock rate - DCE or DTE?
255.255.0.0
Segments
DCE
Hop Count

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

28. What is Layer 5 in the OSI Model?
Shortest path first - (SPF)
Transport
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Session

29. What Layer does CDP operate at?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 64 ip's
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

30. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Data-Link
2 hosts

31. CABLES: What is the T568B Pinout Standard?
/24
255.255.192.0
2 - each port is it's own collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

32. 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
Router(config)#ip route {exit-interface}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 16 ip's

33. EIGRP: How do you view if there are any successor routes?
Router(config)#ip route {network address} {subnet-mask}
Show ip eigrp topology
Switch forwards frame once it completely receives it
Every 8 ip's

34. 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
255.255.255.252
Shortest path first - (SPF)
DUAL: Difusing Update Algorithm

35. Rip: What causes a triggered update?
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
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

36. What is Layer 1 in the OSI Model?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.0.0
Application
Physical

37. Subnetting: What is a 255.255.255.0 in prefix notation
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
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
/24

38. OSPF: What does OSPF use for its metric?
R1(config)#router rip - R1(config-router)#version 2
Add the magic number to the network minus 1
1-65535
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

39. What is Layer 6 in the OSI Model?
Presentation
Add the magic number to the network minus 1
Packets
D

40. CABLES: What is the difference between T568A and T568B?
180 seconds
IEEE 802.3z
Pins 1+2 swap places with pins 3+6
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

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

42. Subnetting: What is a 255.255.255.240 in prefix notation
180
/28
Every 64 ip's
255.255.0.0

43. RIP Timers: What is an invalid Timer?
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.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.128
/24

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

45. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Bellman-Ford
255.255.255.128
62 per network

46. EIGRP: What packet is used to search for networks?
1 - everything hooked to the hub is in the same collision domain
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
Query and other router responds with a REPLY packet.

47. What is the metric for RIP
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Hop Count
DCE
2 hosts

48. RIP Timers: What is an Flush Timer?
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)#
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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.

49. Using the magic number how to you figure the network?
DCE
/24
Closest multiple of the magic number that is not over the interesting octets number.
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.

50. Rip: how do hold down timers work?
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
1 - everything hooked to the hub is in the same collision domain
Bellman-Ford
Pins 1+2 swap places with pins 3+6