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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. Removes entries from the CAM table
The switch port falls back to default setting of half duplex
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
LC - MT-RJ or RJ-45

2. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
The CEF epoch number
Switch#show adjacency [{interface}] [summary | detail]
Collision domain

3. What is the standard for Fast Ethernet (100 Mbps)?
IEEE 802.3u
Interconnecting switches in a campus network
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
On

4. What is the operational mode of a switch port that uses DTP negotiation?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Static access or trunk
Switched virtual interface (SVI)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

5. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Switch(config)#errdisable detect cause gbic-invalid
SVI
400 metres half duplex and 2000 metres full duplex
Collision domain

6. Displays error-disabled recovery timer information
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show errdisable recovery
Switch(config)#errdisable detect cause psecure-violation
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

7. What is the default duplex mode of a 10 Mbps Ethernet interface?
ANSI X3T11 FibreChannel
Full duplex
Half duplex
Down - static access - trunk or tunnel

8. What CEF optimisation technique cache FIB entries in switch line cards?
Trunk
Multilayer Switching
Distributed CEF (dCEF)
Accelerated CEF (aCEF)

9. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
S = Short; L = Long; E = Extra-long
The Discard adjacency
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

10. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause vmps
A station must wait its turn to transmit; it can't transmit and receive at the same time
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

11. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
IEEE 802.3ae
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
IEEE 802.3ab
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

12. What is unknown unicast flooding?
Static access or dynamic
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show adjacency [{interface}] [summary | detail]

13. What is a ternary combination?

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14. What is 10GBASE-SR/SW?
Half duplex
Switch(config)#errdisable detect cause l2ptguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Source MAC address; Port of arrival; VLAN; Time stamp

15. What is ANSI?
FIB with adjacency table
100 metres
American National Standards Institute
Route caching and topology based

16. What is error-disable state?
Half duplex
Numeric values that represent what action to take after the TCAM lookup occurs
A switch port that has been shut down automatically due to a serious error condition
CEF punt

17. What is the name of the CEF engine that forwards packets in hardware?
Switch#show interfaces status err-disabled
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
The Layer 3 forwarding engine
Static access or trunk

18. Enables error-disable for conditions that trigger unicast flood blocking on a port
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#errdisable detect cause udld
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable detect cause unicast-flood

19. How are the TCAM Mask/Value pairs evaluated?
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
In parallel revealing the best (longest) match in a single table lookup
Routing table and ARP table
400 metres half duplex and 2000 metres full duplex

20. What is EMI?
Switch#show errdisable detect
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
American National Standards Institute
Electromagnetic Interference

21. What is 1000BASE-ZX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Collision domain

22. 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
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Switch(config)#errdisable detect cause ilpower
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

23. What is WWDM?
Trunk or dynamic
Distributed CEF (dCEF)
In parallel revealing the best (longest) match in a single table lookup
Wide-Wavelength Division Multiplexing

24. What is 10GBASE-LX4/LW4?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Carrier Sense Multiple Access Collision Detection
Trunk or dynamic
LOU registers

25. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
IEEE 802.3
Tunnel
Wide-Wavelength Division Multiplexing

26. What is TCAM overflow?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Half duplex
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

27. What are the reasons for packets being punted by CEF?
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)#errdisable detect cause link-flap
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Half duplex

28. What two IOS software components are involved in TCAM operation?
Switch(config)#default interface {interface}
Feature Manager (FM) and Switching Database Manager (SDM)
Cisco Express Forwarding
Switch(config)#errdisable detect cause loopback

29. Sets the administrative mode of a switch port to access
Switch(config-if)#switchport mode access
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

30. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Distributed CEF (dCEF)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

31. What is the TCAM Value and Mask for an IP access list?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
American National Standards Institute
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)

32. When should CEF be disabled?
15 metres
Only temporarily for debugging purposes
R = LAN PHY; W = WAN PHY
Switch(config)#errdisable detect cause dtp-flap

33. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
SVI or native routed interface
Switch(config)#errdisable detect cause channel-misconfig
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

34. What are GigaStack GBICs used for?
Switch#show interfaces status err-disabled
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch#show ip cef {interface} [detail]
Switch(config)#default interface {interface}

35. What is the timer range for automatic re-enabling of error-disabled ports?
25 metres
Switch#show ip cef {interface} [detail]
From 30 seconds to 86 -400 seconds (24 hours)
Security and QoS ACLs

36. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause vmps
A name assigned to a ranges of interfaces

37. What is the maximum cabling distance for 10GBASE-LR/LW?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
10 km
Switch(config)#interface range macro {name}
Cabling specifications for Gigabit Ethernet

38. What is the maximum cabling distance for 10GBASE-ER/EW?
Static access - trunk - tunnel or dynamic
The table of learned MAC addresses - ports - and VLAN information
40 km
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

39. What is 1000BASE-LX/LH?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
IEEE 802.3z
On
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

40. Enables error-disable for errors with dynamic ARP inspection
Ternary Content-Addressable Memory
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#interface vlan {vlan-id}

41. What is the default timer for automatic re-enabling of error-disabled ports?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
300 seconds
15 metres
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

42. What is FIB?
Routing table and ARP table
Forwarding Information Base
Trunk or dynamic
Manually by administratively disabling and re-enabling the port

43. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
Switch#show errdisable detect
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
R = LAN PHY; W = WAN PHY
The Layer 3 engine

44. What is the name of physical network segment where data packets can collide with one another when being sent?
When one station transmits at the same time as another on a shared medium
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Collision domain
Configure the appropriate values manually on both ends of the link

45. Displays the contents of the CAM table
Switched virtual interface (SVI)
Switch(config)#errdisable detect cause udld
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#switchport access vlan {vlan}

46. What are the names of CEF optimisation techniques using specialised forwarding hardware?
10 km
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

47. How is link speed determined on Fast Ethernet links configured to autonegotiate?
Switch(config)#errdisable detect cause link-flap
Cisco Express Forwarding
Security and QoS ACLs
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

48. Disables CEF operation on an interface
Switch(config-if)#no ip route-cache cef
10GbE operates only at full duplex
300 seconds
Carrier Sense Multiple Access Collision Detection

49. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
300 seconds
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

50. What is 10GBASE-ER/EW?
Switch(config)#interface {type}{module}/{number}
Tunnel
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)