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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. How is the TCAM organised?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
By Mask/Value - where each unique mask has eight value patterns associated with it
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
300 seconds

2. What is 10GBASE-X?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Electromagnetic Interference
Cabling specifications for 10 Gigabit Ethernet
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

3. Displays the entire Forwarding Information Base (FIB)
Forwarding Information Base
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause arp-inspection
Switch#show ip cef

4. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause ilpower
Cisco Express Forwarding
Enable error-disable for all possible causes
Switch(config)#errdisable detect cause udld

5. What is error-disable state?
Switch(config)#errdisable detect cause l2ptguard
A switch port that has been shut down automatically due to a serious error condition
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Manually by administratively disabling and re-enabling the port

6. What is the maximum cabling distance for 10GBASE-LR/LW?
By Mask/Value - where each unique mask has eight value patterns associated with it
S = Short; L = Long; E = Extra-long
10 km
Switch(config)#default interface {interface}

7. Displays CEF adjacency table information
Value - Mask - and Result (VMR)
Switch#show adjacency [{interface}] [summary | detail]
The table of learned MAC addresses - ports - and VLAN information
Switch#show interfaces {interface} switchport

8. What is the standard for 10 Gigabit Ethernet (10GbE)?
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
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
IEEE 802.3ae
Switch#show adjacency [{interface}] [summary | detail]

9. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
Switch(config)#errdisable detect cause storm-control
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
100 metres
IEEE 802.3ab

10. What is the TCAM Value and Mask for an ICMP access list?
Switch(config)#errdisable detect cause vmps
Switch(config)#no ip cef
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
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

11. What is the maximum cabling distance for 10GBASE-SR/SW?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
UTP Fast Ethernet and Gigabit Ethernet
Packets that have been truncated before they were fully received
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

12. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Creating the VLAN
Tunnel
Source MAC address; Port of arrival; VLAN; Time stamp

13. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
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
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Tunnel

14. Displays switch port information for a specified interface
Switch#show interfaces {interface} switchport
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

15. What are GigaStack GBICs used for?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Logical Operation Unit

16. What is WWDM?
A name assigned to a ranges of interfaces
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Wide-Wavelength Division Multiplexing

17. Removes entries from the CAM table
Switch(config)#errdisable detect cause bpduguard
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

18. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause link-flap
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

19. What is the role of a Switch Engine (SE) in first generation MLS?
Switch(config)#errdisable detect cause rootguard
Multilayer Switching
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

20. What is CSMA/CD?
10 km
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
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause unicast-flood

21. What is the prerequesite for creating a working SVI?
Creating the VLAN
Wide-Wavelength Division Multiplexing
25 metres
CEF glean

22. What is the name of physical network segment where data packets can collide with one another when being sent?
Collision domain
Switch(config)#errdisable detect cause psecure-violation
UTP Fast Ethernet and Gigabit Ethernet
Electromagnetic Interference

23. What is the default duplex mode of a Fast Ethernet interface?
Half duplex
Switch(config)#errdisable detect cause dhcp-rate-limit
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#errdisable detect cause arp-inspection

24. What is 10BASE-T?
CEF punt
Switch#show adjacency [{interface}] [summary | detail]
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

25. Selects a switch port interface and enters interface configuration mode
Switch(config)#mac address-table aging-time {seconds}
S = Short; L = Long; E = Extra-long
Switch(config)#errdisable detect cause psecure-violation
Switch(config)#interface {type}{module}/{number}

26. Displays the CAM table size with number of MAC addresses
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Collision domain
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

27. What is 10GBASE-LR/LW?
Interconnecting switches in a campus network
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

28. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Switched virtual interface (SVI)
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
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)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

29. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show ip cef {interface} [detail]
Switch(config-if)#switchport access vlan {vlan}

30. What is 10GBASE-ER/EW?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Only temporarily for debugging purposes
The switch port falls back to default setting of half duplex

31. What is EMI?
SC fibre optic or RJ-45 UTP
Source MAC address; Port of arrival; VLAN; Time stamp
Cabling specifications for Gigabit Ethernet
Electromagnetic Interference

32. What are the operational modes of a Layer 2 switched interface?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 km
Down - static access - trunk or tunnel
The CEF entry version number

33. What information is recorded in CAM as frames arrive on a switch port?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
In TCAM Value entries
Switch(config)#errdisable recovery interval {seconds}
Source MAC address; Port of arrival; VLAN; Time stamp

34. Specifies the timer for automatic re-enabling of error-disabled ports
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 recovery interval {seconds}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

35. What is 10GBASE-SR/SW?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Cisco Express Forwarding

36. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Dynamic
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
From 30 seconds to 86 -400 seconds (24 hours)

37. Selects an interface-range macro and enters interface configuration mode
The Layer 3 engine
Switch(config)#interface {type}{module}/{number}
Switch(config)#interface range macro {name}
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

38. What are the Fast Ethernet autonegotiation selection priorities?
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
25 metres
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

39. Enables error-disable when trunking encapsulation is flapping from one type to another
Electromagnetic Interference
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config)#errdisable detect cause dtp-flap

40. Configures a switch port with a static access VLAN assignment
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
A three-fold combination of 0 - 1 and X (don't care)
Switch#show errdisable detect
Switch(config-if)#switchport access vlan {vlan}

41. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
Value - Mask - and Result (VMR)
The Layer 3 engine
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

42. Displays a list of all interfaces in an error-disabled state
When one station transmits at the same time as another on a shared medium
Switch#show interfaces status err-disabled
SC or MT-RJ
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

43. What is 100BASE-FX?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Down - static access - trunk or tunnel
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

44. What is an interface-range macro?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
A name assigned to a ranges of interfaces
LOU registers

45. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Switch(config)#errdisable detect cause channel-misconfig

46. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
300 seconds
Switch#show ip cef
Logical Operation Unit
The Punt adjacency

47. What are the administrative modes of Layer 2 switched interfaces?
Static access - trunk - tunnel or dynamic
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#interface range macro {name}

48. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Tunnel
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
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 ilpower

49. What function is performed by the Feature Manager (FM)?
Cabling specifications for 10 Gigabit Ethernet
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Compiling Access Control Entries (ACE) into the TCAM table
On

50. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Only temporarily for debugging purposes
SC fibre optic or RJ-45 UTP
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#errdisable detect cause l2ptguard