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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 10GBASE-LX4/LW4?
IEEE 802.3ae
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Enable error-disable for all possible causes
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

2. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Institute of Electrical and Electronics Engineers
Tunnel
Electromagnetic Interference

3. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Only temporarily for debugging purposes
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show errdisable recovery
Tunnel

4. Displays administrative and operational status for a specified interface
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show interfaces {interface}
Switch(config-if)#duplex {auto | full | half}

5. What is the maximum cabling distance for 1000BASE-LX/LH?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#errdisable detect cause channel-misconfig
Switch(config)#errdisable detect cause gbic-invalid
Static access - trunk - tunnel or dynamic

6. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Off
They are dropped (ARP throttling)
Static access or trunk

7. What is the default duplex mode of a Fast Ethernet interface?
CEF punt
Half duplex
Switch(config)#errdisable detect cause storm-control
Security and QoS ACLs

8. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config-if)#no switchport
S = Short; L = Long; E = Extra-long
The adjacency table

9. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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10. Displays the entire Forwarding Information Base (FIB)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch#show ip cef
15 metres
In parallel revealing the best (longest) match in a single table lookup

11. What is the original standard for Ethernet (10 Mbps)?
IEEE 802.3
IEEE 802.3ab
Trunk
Switch#show adjacency [{interface}] [summary | detail]

12. What is 100BASE-T4?
Switch(config)#default interface {interface}
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

13. What are the common cabling specifications for Gigabit Ethernet?
IEEE 802.3z
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause dhcp-rate-limit
Static access

14. What are runts?
Institute of Electrical and Electronics Engineers
XENPAK - X2 - or SFP+
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Packets that have been truncated before they were fully received

15. What is MLS?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Multilayer Switching
Switch(config)#errdisable detect cause unicast-flood
Security and QoS ACLs

16. What two IOS software components are involved in TCAM operation?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause loopback
A station must wait its turn to transmit; it can't transmit and receive at the same time
Switch(config)#errdisable detect cause storm-control

17. What are the reasons for packets being dropped by CEF?
Switch(config)#errdisable detect cause dtp-flap
Dynamic
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
SC fibre optic or RJ-45 UTP

18. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
LOU registers
Trunk or dynamic

19. What is IEEE?
Full duplex only
Switch#show interfaces status err-disabled
Security and QoS ACLs
Institute of Electrical and Electronics Engineers

20. What are the duplex modes of a GigaStack GBIC?
Distributed CEF (dCEF)
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#default interface {interface}

21. Disables a switch port
Switched virtual interface (SVI)
Switch(config-if)#shutdown
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
Full duplex only

22. Resets the configuration of a switch port to its default values
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch(config)#default interface {interface}
Switch#show interfaces {interface}

23. What is 1000BASE-X?
Creating the VLAN
Cabling specifications for Gigabit Ethernet
Logical Operation Unit
Switch(config)#errdisable detect cause gbic-invalid

24. What CEF adjacency is used to discard packets because of access list or other policy action?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config)#errdisable detect cause arp-inspection
The CEF epoch number
The Discard adjacency

25. What information is stored in CAM?
Full duplex
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause psecure-violation

26. How is the TCAM organised?
Cabling specifications for Gigabit Ethernet
By Mask/Value - where each unique mask has eight value patterns associated with it
The Drop adjacency
IEEE 802.3z

27. What is the standard for Gigabit Ethernet (1000 Mbps)?
Accelerated CEF (aCEF)
IEEE 802.3z
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
15 metres

28. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
CEF punt
The switch port falls back to default setting of half duplex
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

29. What is the standard for Fast Ethernet (100 Mbps)?
IEEE 802.3u
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Off
300 seconds

30. What is a SVI?
By Mask/Value - where each unique mask has eight value patterns associated with it
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switched virtual interface (SVI)

31. What is the name of the CEF engine that forwards packets in hardware?
LOU registers
Static access or trunk
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
The Layer 3 forwarding engine

32. What are the administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
Native routed interface
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Dynamic

33. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Route caching and topology based
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
XENPAK - X2 - or SFP+

34. What combinations are TCAM entries composed of?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
IEEE 802.3z
Value - Mask - and Result (VMR)
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

35. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
400 metres half duplex and 2000 metres full duplex
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#errdisable recovery interval {seconds}

36. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
A name assigned to a ranges of interfaces
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
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
40 km

37. What are the default error-disable detection causes?
A station must wait its turn to transmit; it can't transmit and receive at the same time
Enable error-disable for all possible causes
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
10 km

38. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Store-and-forward
Half duplex
The CEF entry version number
The Punt adjacency

39. What is 10GBASE-CX4?
Switch(config)#errdisable detect cause link-flap
Switch(config)#errdisable detect cause channel-misconfig
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch(config)#errdisable detect cause storm-control

40. When should CEF be disabled?
Collision domain
Only temporarily for debugging purposes
When one station transmits at the same time as another on a shared medium
25 metres

41. What is the timer range for automatic re-enabling of error-disabled ports?
CEF punt
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Full duplex

42. What function is performed by the Switching Database Manager (SDM)?
10 km
Partition and tune the TCAM on some Catalyst switches into areas for different functions
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#errdisable detect cause psecure-violation

43. What is ANSI?
American National Standards Institute
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
10 km
Switch(config)#interface {type}{module}/{number}

44. When can a switch start to learn source MAC addresses on incoming ports?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
70 km for 9 micron SMF; 100 km for 8 micron SMF
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch(config)#interface {type}{module}/{number}

45. What is the name of physical network segment where data packets can collide with one another when being sent?
XENPAK - X2 - or SFP+
Collision domain
Configure the appropriate values manually on both ends of the link
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

46. Enables error-disable for errors with dynamic ARP inspection
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 recovery cause {all | {cause-name}}
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause arp-inspection

47. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
Switch(config-if)#shutdown
Multilayer Switching
Switch#show interfaces status err-disabled

48. What is WAN PHY used for?
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
IEEE 802.3
Dynamic
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

49. Specifies the timer for automatic re-enabling of error-disabled ports
Full duplex only
Switch(config)#errdisable recovery interval {seconds}
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
Native routed interface

50. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Static access - trunk - tunnel or dynamic
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
In TCAM Value entries
The adjacency table