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Test your basic knowledge |
CCENT
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
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. Rip: What does v2 have that v1 does not?
255.255.255.252
110
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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. 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
1-65535
IEEE 802.3z
Show ip eigrp topology
3. What is Layer 2 in the OSI Model?
D
Data-Link
Transport
126 per network
4. 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
Closest multiple of the magic number that is not over the interesting octets number.
120
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
5. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Presentation
Layer 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Network
6. Subnetting: where do the networks break with a /28
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7. Using the magic number how to you figure the broadcast?
IEEE 802.3u
Add the magic number to the network minus 1
Segments
Every 4 ip's
8. What is the Transport PDU called?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
DUAL: Difusing Update Algorithm
/24
Segments
9. What is Layer 7 in the OSI Model?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
DUAL: Difusing Update Algorithm
Application
180 seconds
10. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.224
11. RIP: What Algorithm is used in RIP>
Bellman-Ford
255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3ab
12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Bellman-Ford
Layer 2
Session
13. Subnetting: where do the networks break with a /30
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14. What is the metric for RIP
Hop Count
2 - the bridge separates the collision domain
Network
Segments
15. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
255.255.255.224
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
16. Rip Timers: How long is the default for Flush timer.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
60
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
17. What is Layer 1 in the OSI Model?
Switch forwards the frame as soon as it can
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Physical
R
18. RIP Timers: What is an Flush Timer?
/22
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.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Application
19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
180 seconds
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 eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
20. Subnetting: where do the networks break with a /25
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21. EIGRP: What is the range of Autonomous System numbers?
D
255.255.0.0
1-65535
Network
22. Rip: What is the command to enable Ripv2?
180 seconds
R1(config)#router rip - R1(config-router)#version 2
180
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
23. Subnetting: where do the networks break with a /27
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24. What are the comands to set the clock rate in a serial connection?
2 hosts
DCE
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
25. RIP Timers: What is an Holddown Timer?
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Application
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
26. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Pins 1+2 swap places with pins 3+6
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Network
27. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
28. EIGRP: What is the hello packet used for?
100
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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
29. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets
30. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Layer 2
Every 32 ip's
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
31. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
2 - each port is it's own collision domain
Session
255.255.255.252
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
32. Subnetting: where do the networks break with a /26
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33. What Layer does CDP operate at?
Layer 2
Data-Link
180 seconds
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
34. Symbol for Rip on a Show ip route
255.255.192.0
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
R
255.255.255.128
35. IEEE Standards: Ethernet
120
IEEE 802.3
180
1-65535
36. What is Layer 3 in the OSI Model?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Transport
Network
/22
37. OSPF: What is the default administrative distance?
Add the magic number to the network minus 1
110
Query and other router responds with a REPLY packet.
2 - each port is it's own collision domain
38. What are the commands to setup SSH?
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
Packets
Query and other router responds with a REPLY packet.
39. What is the boot sequence for Cisco Routers?
Every 128 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Presentation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
40. Rip and EIGRP use what to keep other routers aware of their status?
Every 32 ip's
/9
D
Periodic Updates of their routing table
41. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.192.0
Switch forwards the frame as soon as it can
2 hosts
42. Subnetting: What is a /27 in Decimal
Every 4 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Every 8 ip's
255.255.255.224
43. RIP Timers: What is an invalid Timer?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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.
Every 8 ip's
44. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
Every 4 ip's
255.255.0.0
Network
45. Switching Methods: What is Store and Forward?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
2 hosts
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Switch forwards frame once it completely receives it
46. CABLES: What is the T568B Pinout Standard?
IEEE 802.3ab
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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
47. Subnetting: What is a /16 in Decimal
Network
110
IEEE 802.3
255.255.0.0
48. 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
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
IEEE 802.3z
110
49. Rip Timers: How long is the default for Invalid timer.
Every 8 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
180 seconds
Every 4 ip's
50. How many Collision domains are there on a with 1 switch 2 computers?
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