Test your basic knowledge |

Ethernet Technologies

Subject : it-skills

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 the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Static access
100 metres
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Store-and-forward

2. What is the standard for Gigabit Ethernet (1000 Mbps)?
Value - Mask - and Result (VMR)
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
IEEE 802.3ab
IEEE 802.3z

3. What is the standard for 1000BASE-T?
IEEE 802.3ab
The Null adjacency
SC or MT-RJ
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

4. What is WAN PHY used for?
25 metres
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
The adjacency table
Slow response times - low throughput - runts and other input errors on the switch ports

5. What is the DTP negotiation mode of a switch port configured as trunk?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Down - static access - trunk or tunnel
On
Forwarding Information Base

6. What is the default duplex mode of a Gigabit Ethernet interface?
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Full duplex
American National Standards Institute

7. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Half duplex
300 seconds
Collision domain
SC or MT-RJ

8. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
400 metres half duplex and 2000 metres full duplex
Creating the VLAN
Switch(config-if)#switchport access vlan {vlan}
CEF glean

9. What is the DTP negotiation mode of a switch port configured as dynamic?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
When one station transmits at the same time as another on a shared medium
Accelerated CEF (aCEF)
On

10. Displays switch port information for a specified interface
When one station transmits at the same time as another on a shared medium
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show interfaces {interface} switchport
Full duplex

11. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
IEEE 802.3ab
100 metres
Switch(config)#errdisable recovery interval {seconds}

12. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
25 metres
Switch(config)#errdisable detect cause rootguard
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

13. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
LOU registers
SVI
IEEE 802.3
Dynamic

14. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
LC - MT-RJ or RJ-45
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
SC or MT-RJ
400 metres half duplex and 2000 metres full duplex

15. What CEF adjacency is used to switch packets destined for the null interface?
Tunnel
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#interface {type}{module}/{number}
The Null adjacency

16. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
The Punt adjacency
Switch(config)#errdisable detect cause storm-control
ANSI X3T11 FibreChannel

17. Selects a switch port interface and enters interface configuration mode
On
Switch(config)#interface {type}{module}/{number}
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

18. What are the default error-disable detection causes?
Enable error-disable for all possible causes
The Layer 3 forwarding engine
Full duplex
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

19. What is the name of a Layer 3 physical interface on a switch?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
LC - MT-RJ or RJ-45
Native routed interface
10 km

20. What is the default duplex mode of a 10 Mbps Ethernet interface?
A name assigned to a ranges of interfaces
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switch(config-if)#no ip route-cache cef
Half duplex

21. What are runts?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Packets that have been truncated before they were fully received
The adjacency table
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

22. What is 1000BASE-CX?
Cabling specifications for 10 Gigabit Ethernet
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show cef not-cef-switched
SC or MT-RJ

23. What tables are maintained by the CEF Layer 3 forwarding engine?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
FIB with adjacency table
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable detect cause security-violation

24. What are the Gigabit Ethernet autonegotiation selection priorities?
Down - static access - trunk or tunnel
1000BASE-T full duplex followed by 1000BASE-T half duplex
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery interval {seconds}

25. What is 10GBASE-LR/LW?
1 -2 on one end with 3 -6 on the other end
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end
Switch(config)#errdisable detect cause unicast-flood
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

26. Enables error-disable for errors with offering inline power
Down - static access - trunk or tunnel
Switch(config)#errdisable detect cause ilpower
Switch(config-if)#no ip route-cache cef
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

27. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Tunnel
The CEF epoch number
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
SC fibre optic or RJ-45 UTP

28. What are the Fast Ethernet autonegotiation selection priorities?
Cabling specifications for 10 Gigabit Ethernet
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch(config)#errdisable detect cause vmps
Full duplex only

29. Disables CEF operation on an interface
Switch(config)#errdisable recovery interval {seconds}
Switch(config)#errdisable detect cause loopback
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config-if)#no ip route-cache cef

30. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
S = Short; L = Long; E = Extra-long
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Forwarding Information Base
10 km

31. What is 1000BASE-T?
Switch#show running-config interface {interface}
The CEF epoch number
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#errdisable detect cause dtp-flap

32. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#errdisable detect cause pagp-flap
Route caching and topology based
Electromagnetic Interference

33. What is 10BASE-T?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

34. What are the names of the two basic generations of MLS?
The Drop adjacency
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Route caching and topology based
Manually by administratively disabling and re-enabling the port

35. What Ethernet ports allow for autonegotiation?
Off
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show cef drop
UTP Fast Ethernet and Gigabit Ethernet

36. What are the administrative modes of Layer 2 switched interfaces?
Only temporarily for debugging purposes
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config-if)#switchport mode access

37. Displays CEF Punt statistics with number of packets and reason for each line card
Switch(config)#errdisable detect cause link-flap
Switch#show cef not-cef-switched
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause ilpower

38. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
The Layer 3 engine
Trunk
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

39. What is the standard for Fast Ethernet (100 Mbps)?
Routing table and ARP table
Off
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
IEEE 802.3u

40. Displays the CAM table size with number of MAC addresses
IEEE 802.3
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
70 km for 9 micron SMF; 100 km for 8 micron SMF

41. Displays error-disabled detection status
Down - static access - trunk or tunnel
Switch#show errdisable detect
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

42. What connectors can be used with SFP modules?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
ANSI X3T11 FibreChannel
LC - MT-RJ or RJ-45
Half duplex

43. Adds a description to an interface configuration
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch(config-if)#description {string}
SVI

44. What is the maximum cabling distance for 1000BASE-CX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Numeric values that represent what action to take after the TCAM lookup occurs
Switch#show cef drop
25 metres

45. What is 1000BASE-ZX?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Accelerated CEF (aCEF)
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#no ip cef

46. What information is stored in CAM?
The table of learned MAC addresses - ports - and VLAN information
The adjacency table
Switch#show running-config interface {interface}
Switch(config-if)#shutdown

47. What CEF adjacency is used to discard packets because of access list or other policy action?
The Discard adjacency
Switch(config-if)#shutdown
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show cef drop

48. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Configure the appropriate values manually on both ends of the link
Switch(config)#errdisable recovery interval {seconds}
A name assigned to a ranges of interfaces
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

49. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Packets that have been truncated before they were fully received
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#show cef drop

50. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch#show ip cef {interface} [detail]
They are dropped (ARP throttling)