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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 the administrative mode of a switch port that carries traffic for multiple VLANs?
Routing table and ARP table
Switch(config-if)#description {string}
In TCAM Value entries
Trunk or dynamic

2. What is 1000BASE-LX/LH?
Switch(config)#errdisable detect cause loopback
Store-and-forward
100 metres
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

3. What happens to subsequent packets destined for FIB entries in CEF glean state?
They are dropped (ARP throttling)
Switch(config)#errdisable detect cause arp-inspection
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

4. Adds a description to an interface configuration
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config-if)#description {string}
100 metres
Routing table and ARP table

5. What function is performed by the Switching Database Manager (SDM)?
Switch(config-if)#duplex {auto | full | half}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Electromagnetic Interference
They are dropped (ARP throttling)

6. Sets the administrative mode of a switch port to access
The Punt adjacency
Switch(config-if)#switchport mode access
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
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

7. What are the default error-disable detection causes?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Only temporarily for debugging purposes
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Enable error-disable for all possible causes

8. What is LAN PHY used for?
Switch(config)#errdisable detect cause unicast-flood
Interconnecting switches in a campus network
Static access - trunk - tunnel or dynamic
IEEE 802.3ab

9. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config)#errdisable detect cause gbic-invalid
10 km
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Process the first packet in a traffic flow to determine the destination

10. What is 100BASE-FX?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
10 km
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

11. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Switch(config-if)#switchport access vlan {vlan}
Off
Configure the appropriate values manually on both ends of the link

12. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Distributed CEF (dCEF)
Switch(config)#errdisable detect cause vmps

13. What CEF adjacency is used to switch packets that can't be forwarded normally?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Store-and-forward
CEF punt
The Drop adjacency

14. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Feature Manager (FM) and Switching Database Manager (SDM)
The Punt adjacency
The switch port falls back to default setting of half duplex
On

15. What is the maximum cabling distance for 1000BASE-LX/LH?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
They are dropped (ARP throttling)
R = LAN PHY; W = WAN PHY

16. Enables automatic re-enabling of error-disabled ports
10 km
Switch#show errdisable recovery
Switch(config)#errdisable recovery cause {all | {cause-name}}
A station must wait its turn to transmit; it can't transmit and receive at the same time

17. What two IOS software components are involved in TCAM operation?
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause ilpower
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Feature Manager (FM) and Switching Database Manager (SDM)

18. What is the TCAM Value and Mask for an Ethernet access list?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
SVI
On

19. What connectors can be used with GBIC modules?
Static access
In TCAM Value entries
Distributed CEF (dCEF)
SC fibre optic or RJ-45 UTP

20. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
In TCAM Value entries
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

21. What Ethernet ports allow for autonegotiation?
Switch(config-if)#description {string}
Packets that have been truncated before they were fully received
UTP Fast Ethernet and Gigabit Ethernet
Switch(config)#errdisable detect cause link-flap

22. What is a SVI?
Switched virtual interface (SVI)
Routing table and ARP table
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config-if)#switchport access vlan {vlan}

23. Displays the entire Forwarding Information Base (FIB)
Switch#show ip cef
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Routing table and ARP table
100 metres

24. What is MLS?
Trunk or dynamic
Multilayer Switching
The Null adjacency
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

25. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Forwarding Information Base
LOU registers
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config-if)#no switchport

26. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Trunk
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

27. What is 10GBASE-LX4/LW4?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
10 km
The CEF epoch number
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

28. What are the names of the two basic generations of MLS?
Route caching and topology based
Manually by administratively disabling and re-enabling the port
100 metres
When one station transmits at the same time as another on a shared medium

29. What is 10GBASE-SR/SW?
Cabling specifications for Gigabit Ethernet
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Accelerated CEF (aCEF)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)

30. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch(config)#no ip cef
300 seconds
25 metres
Switch(config)#errdisable detect cause dtp-flap

31. What is Fast EtherChannel (FEC)?
Native routed interface
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable recovery cause {all | {cause-name}}

32. How is the TCAM organised?
Switch#show errdisable recovery
Cisco Express Forwarding
Ternary Content-Addressable Memory
By Mask/Value - where each unique mask has eight value patterns associated with it

33. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery interval {seconds}
Switch#show cef not-cef-switched
Switch(config)#errdisable detect cause arp-inspection
On

34. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
LC - MT-RJ or RJ-45
The Drop adjacency
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

35. What is the prerequesite for creating a working SVI?
Feature Manager (FM) and Switching Database Manager (SDM)
Creating the VLAN
Switch#show running-config interface {interface}
A switch port that has been shut down automatically due to a serious error condition

36. Enables error-disable for misconfiguration of EtherChannel bundles
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#errdisable detect cause channel-misconfig
Switch(config-if)#no switchport
Switch(config)#default interface {interface}

37. What is the original standard for Ethernet (10 Mbps)?
Switch#show interfaces status err-disabled
IEEE 802.3
R = LAN PHY; W = WAN PHY
Switch#show interfaces {interface}

38. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Wide-Wavelength Division Multiplexing
The CEF entry version number
Forwarding Information Base

39. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Static access
IEEE 802.3z
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#errdisable detect cause bpduguard

40. What is 100BASE-T2?
Switch(config)#errdisable detect cause l2ptguard
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 specifications for 10 Gigabit Ethernet
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

41. What is the DTP negotiation mode of a switch port configured as dynamic?
On
CEF punt
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
A name assigned to a ranges of interfaces

42. What is the default age-out time for stale entries in the CAM table?
Full duplex
300 seconds
Switch(config)#errdisable detect cause pagp-flap
Content-Addressable Memory

43. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Switch(config)#errdisable detect cause pagp-flap
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
CEF punt
Switch(config)#errdisable detect cause storm-control

44. What is CSMA/CD?
Collision domain
Switch(config-if)#no switchport
IEEE 802.3u
Carrier Sense Multiple Access Collision Detection

45. What combinations are TCAM entries composed of?
Switch#show interfaces status
Value - Mask - and Result (VMR)
IEEE 802.3u
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

46. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
XENPAK - X2 - or SFP+
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
25 metres
Static access

47. What connectors can be used with SFP modules?
Switch#show cef drop
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause unicast-flood

48. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
Switch#show interfaces status err-disabled
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3
S = Short; L = Long; E = Extra-long

49. What is 1000BASE-T?
XENPAK - X2 - or SFP+
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Accelerated CEF (aCEF)
LC - MT-RJ or RJ-45

50. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
SVI
A three-fold combination of 0 - 1 and X (don't care)
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
The CEF epoch number