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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 are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause ilpower
XENPAK - X2 - or SFP+
CEF punt

2. Disables CEF operation on an interface
Carrier Sense Multiple Access Collision Detection
Switch(config)#errdisable detect cause unicast-flood
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause channel-misconfig

3. How does topology based switching work?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
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
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
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

4. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Switch#show ip cef
Slow response times - low throughput - runts and other input errors on the switch ports
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Full duplex only

5. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
Switch(config)#errdisable detect cause pagp-flap
1 -2 on one end with 3 -6 on the other end
Switch(config)#errdisable detect cause storm-control
Half duplex

6. What is 10GBASE-X?
Switch(config)#errdisable detect cause link-flap
Cabling specifications for 10 Gigabit Ethernet
300 seconds
A three-fold combination of 0 - 1 and X (don't care)

7. What are the administrative modes of Layer 2 switched interfaces?
On
Value - Mask - and Result (VMR)
Static access - trunk - tunnel or dynamic
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

8. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Manually by administratively disabling and re-enabling the port
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Cisco Express Forwarding
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

9. What is the DTP negotiation mode of a switch port configured as static access?
Off
Value - Mask - and Result (VMR)
Switch(config)#errdisable detect cause dtp-flap
They are dropped (ARP throttling)

10. Displays a list of all interfaces in an error-disabled state
Switch#show interfaces status err-disabled
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#no ip cef

11. What is the DTP negotiation mode of a switch port configured as dynamic?
The Discard adjacency
On
Cisco Express Forwarding
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

12. What is the name of physical network segment where data packets can collide with one another when being sent?
Collision domain
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
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

13. What tables are maintained by the CEF Layer 3 engine?
Collision domain
Switch(config)#errdisable detect cause arp-inspection
Routing table and ARP table
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

14. What is 1000BASE-ZX?
Electromagnetic Interference
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
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

15. Displays switch port information for a specified interface
Switch#show interfaces {interface} switchport
The CEF epoch number
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
A name assigned to a ranges of interfaces

16. What two IOS software components are involved in TCAM operation?
Switch(config)#errdisable detect cause l2ptguard
Switch(config-if)#switchport access vlan {vlan}
Feature Manager (FM) and Switching Database Manager (SDM)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

17. What connectors can be used with SFP modules?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Value - Mask - and Result (VMR)
LC - MT-RJ or RJ-45
Routing table and ARP table

18. What CEF optimisation technique cache FIB entries in switch line cards?
Accelerated CEF (aCEF)
Static access or trunk
SVI
Switch#show interfaces status err-disabled

19. What is MLS?
Electromagnetic Interference
IEEE 802.3
CEF punt
Multilayer Switching

20. What are the types of layer 3 switched interfaces
Switch#show ip cef {interface} [detail]
UTP Fast Ethernet and Gigabit Ethernet
Switch(config)#errdisable detect cause udld
SVI or native routed interface

21. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Multilayer Switching
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 IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config-if)#no ip route-cache cef

22. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#no ip cef
25 metres
Switch(config)#interface vlan {vlan-id}
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

23. What is a ternary combination?

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24. Enables error-disable for when the port link state is flapping between the up and down states
Switch(config)#errdisable detect cause link-flap
Switch#show interfaces status err-disabled
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

25. Displays dynamic CAM table entries
IEEE 802.3
They are dropped (ARP throttling)
Switch(config-if)#shutdown
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

26. What is the role of a Switch Engine (SE) in first generation MLS?
300 seconds
A switch port that has been shut down automatically due to a serious error condition
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
On

27. What CEF optimisation replicates the entire FIB table among switch line cards?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Distributed CEF (dCEF)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

28. What is the TCAM Value and Mask for an Ethernet access list?
The Layer 3 engine
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
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

29. What are the common cabling specifications for Fast Ethernet?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Down - static access - trunk or tunnel
Switch(config)#errdisable detect cause vmps
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

30. What is half duplex operation?

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31. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
Switch(config)#errdisable detect cause dtp-flap
Institute of Electrical and Electronics Engineers
IEEE 802.3

32. What is LAN PHY used for?
Interconnecting switches in a campus network
R = LAN PHY; W = WAN PHY
Switch(config)#no ip cef
Switch(config)#errdisable detect cause pagp-flap

33. What are the names of the two basic generations of MLS?
Collision domain
Route caching and topology based
Tunnel
Switch#show errdisable detect

34. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause gbic-invalid
When one station transmits at the same time as another on a shared medium
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

35. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Cabling specifications for 10 Gigabit Ethernet
Interconnecting switches in a campus network
Switch(config-if)#duplex {auto | full | half}
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

36. What is the content of TCAM Result entries?
Source MAC address; Port of arrival; VLAN; Time stamp
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#errdisable detect cause dhcp-rate-limit

37. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch#show errdisable detect
The CEF epoch number
A three-fold combination of 0 - 1 and X (don't care)

38. Enables error-disable for misconfiguration of EtherChannel bundles
Switch(config)#errdisable detect cause channel-misconfig
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
A name assigned to a ranges of interfaces

39. What is WWDM?
Switch#show running-config interface {interface}
LAN PHY and WAN PHY
Wide-Wavelength Division Multiplexing
Route caching and topology based

40. What is the operational mode of a switch port that uses DTP negotiation?
Static access or trunk
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

41. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Switch(config)#errdisable recovery cause {all | {cause-name}}
Static access or trunk
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

42. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
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
Enable error-disable for all possible causes
Switched virtual interface (SVI)
A station must wait its turn to transmit; it can't transmit and receive at the same time

43. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Configure the appropriate values manually on both ends of the link

44. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
They are dropped (ARP throttling)
10 km
Switch(config-if)#switchport mode access
UTP Fast Ethernet and Gigabit Ethernet

45. What is the maximum cabling distance for 1000BASE-CX?
R = LAN PHY; W = WAN PHY
Creating the VLAN
Switch#show cef not-cef-switched
25 metres

46. What is a GigaStack GBIC?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Process the first packet in a traffic flow to determine the destination
Cabling specifications for 10 Gigabit Ethernet

47. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
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
Switch(config)#errdisable detect cause l2ptguard
Switch(config-if)#no switchport
LOU registers

48. What is TCAM?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config)#errdisable detect cause gbic-invalid
70 km for 9 micron SMF; 100 km for 8 micron SMF
Ternary Content-Addressable Memory

49. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Cabling specifications for Gigabit Ethernet
Switch(config-if)#speed {10 | 100 | 1000 | auto}
The switch port falls back to default setting of half duplex
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

50. What is a SVI?
Switched virtual interface (SVI)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate