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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. Subnetting: What is a /18 in Decimal
255.255.192.0
100
Every 16 ip's
Packets
2. How many Collision domains are there on a with 1 hub and 2 computers?
Every 32 ip's
1 - everything hooked to the hub is in the same collision domain
Packets
255.255.0.0
3. What is the metric for EIGRP
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Bandwidth - Delay - reliability and Load
Network
/22
4. What is the Transport PDU called?
Query and other router responds with a REPLY packet.
Switch forwards frame once it completely receives it
IEEE 802.3u
Segments
5. Subnetting: What is a 255.128.0.0 in prefix notation
/24
Bellman-Ford
/9
255.255.192.0
6. Subnetting: What is a /30 in Decimal
R3(config)#router rip - R3(config-router)#network 192.168.1.2
DUAL: Difusing Update Algorithm
255.255.255.252
Every 128 ip's
7. How many Collision domains are there on a with 1 switch 2 computers?
8. CABLES: What is the T568B Pinout Standard?
R
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 8 ip's
180 seconds
9. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Data-Link
Packets
Physical
10. Subnetting: What is a /16 in Decimal
Show ip eigrp topology
255.255.0.0
Segments
Shortest path first - (SPF)
11. Subnetting: where do the networks break with a /27
12. OSPF: What is the default administrative distance?
110
180
Transport
Frames
13. OSPF: What Algorithm is used?
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.
Router(config)#ip route {exit-interface}
R
Shortest path first - (SPF)
14. IEEE Standards: Fast Ethernet
120
/9
Presentation
IEEE 802.3u
15. Rip: What causes a triggered update?
Frames
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in 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
100
16. OSPF: What is the process used by OSPF to build a routing table (step by step)
Packets
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
Pins 1+2 swap places with pins 3+6
17. What is the layer 4 PDU called?
Every 32 ip's
Session
Segments
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
18. 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
IEEE 802.3z
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
19. Subnetting: What is a /27 in Decimal
255.255.255.224
1 - everything hooked to the hub is in the same collision domain
Every 32 ip's
Shortest path first - (SPF)
20. 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
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Every 32 ip's
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
21. EIGRP: What packet is used to propagate routing information?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
R
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
22. Subnetting: where do the networks break with a /25
23. What is Layer 5 in the OSI Model?
100
Packets
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Session
24. Symbol for Rip on a Show ip route
180 seconds
Bellman-Ford
R
Transport
25. 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
60
/24
180
26. Switching Methods: What is Cut-through?
180
Packets
Switch forwards the frame as soon as it can
2 - the bridge separates the collision domain
27. OSPF: how do you change the cost of an interface for OSPF?
Application
Transport
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
110
28. Subnetting: where do the networks break with a /29
29. IEEE Standards: Gibabit Ethernet (Copper)
Switch forwards frame once it completely receives it
60
IEEE 802.3ab
Add the magic number to the network minus 1
30. Rip Timers: How long is the default for Invalid timer.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
180 seconds
Show ip eigrp topology
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
31. Name the TCP/IP Layers
Periodic Updates of their routing table
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
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
32. Subnetting: What is a /25 in Decimal
/24
100
255.255.255.128
Segments
33. What gets the clock rate - DCE or DTE?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
DCE
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
Pins 1+2 swap places with pins 3+6
34. CABLES: What is the difference between T568A and T568B?
Periodic Updates of their routing table
Pins 1+2 swap places with pins 3+6
255.255.255.224
Router(config)#ip route {network address} {subnet-mask}
35. What is the Data-Link PDU called?
Frames
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
/28
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
36. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
126 per network
Presentation
Bellman-Ford
37. IEEE Standards: Gibabit Ethernet (Fibre)
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
IEEE 802.3z
Layer 2
38. Subnetting: where do the networks break with a /26
39. RIP Timers: What is an Holddown Timer?
/22
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Show ip eigrp topology
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
40. EIGRP: What is the default administrative distance?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
100
/24
Every 64 ip's
41. Rip: What does v2 have that v1 does not?
2 - each port is it's own collision domain
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Switch forwards frame once it completely receives it
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.
42. 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
255.255.0.0
Frames
Frames
43. CABLES: What is the T568A Pinout Standard?
Bandwidth - Delay - reliability and Load
Every 128 ip's
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
44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Shortest path first - (SPF)
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
62 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
45. What is Layer 4 in the OSI Model?
Transport
R1(config)#router rip - R1(config-router)#version 2
Router(config)#ip route {exit-interface}
2 - each port is it's own collision domain
46. What is Layer 7 in the OSI Model?
255.255.192.0
Frames
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Application
47. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
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
Segments
180
48. Subnetting: What is a 255.255.255.240 in prefix notation
Packets
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
30 per network
/28
49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Switch forwards the frame as soon as it can
30 per network
126 per network
Every 8 ip's
50. What is the layer 3 PDU called?
Session
Bandwidth - Delay - reliability and Load
2 hosts
Packets