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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. Displays interface configuration information
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Switch#show running-config interface {interface}
10GbE operates only at full duplex
When one station transmits at the same time as another on a shared medium

2. What CEF optimisation replicates the entire FIB table among switch line cards?
SC or MT-RJ
Distributed CEF (dCEF)
By Mask/Value - where each unique mask has eight value patterns associated with it
SC fibre optic or RJ-45 UTP

3. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
LAN PHY and WAN PHY
25 metres
Tunnel
70 km for 9 micron SMF; 100 km for 8 micron SMF

4. What is 100BASE-T2?
Switch(config)#errdisable detect cause ilpower
LC - MT-RJ or RJ-45
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

5. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Static access or trunk
70 km for 9 micron SMF; 100 km for 8 micron SMF
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
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

6. 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#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch#show interfaces {interface} switchport

7. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch(config-if)#switchport mode access

8. Enables error-disable for errors with offering inline power
Switch(config)#errdisable detect cause ilpower
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
10GbE operates only at full duplex
Switch(config)#interface range macro {name}

9. What is IEEE?
Switch(config)#errdisable detect cause unicast-flood
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Slow response times - low throughput - runts and other input errors on the switch ports
Institute of Electrical and Electronics Engineers

10. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config-if)#no switchport
The adjacency table
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
Static access

11. What is EMI?
Electromagnetic Interference
Configure the appropriate values manually on both ends of the link
Static access or dynamic
Institute of Electrical and Electronics Engineers

12. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
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
In TCAM Value entries
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Carrier Sense Multiple Access Collision Detection

13. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Numeric values that represent what action to take after the TCAM lookup occurs
Forwarding Information Base
The CEF entry version number
300 seconds

14. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch#show errdisable recovery
Value - Mask - and Result (VMR)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause dtp-flap

15. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
SC or MT-RJ
Store-and-forward
Switch(config)#errdisable detect cause {all | {cause-name}}
Institute of Electrical and Electronics Engineers

16. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
Switch(config)#errdisable detect cause gbic-invalid
The switch port falls back to default setting of half duplex
In TCAM Value entries
UTP Fast Ethernet and Gigabit Ethernet

17. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause dtp-flap
Switch(config)#errdisable detect cause pagp-flap

18. What is CEF?
Cisco Express Forwarding
Tunnel
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Routing table and ARP table

19. Displays error-disabled recovery timer information
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
On
Half duplex
Switch#show errdisable recovery

20. Displays a list of all interfaces in an error-disabled state
IEEE 802.3u
Switch#show interfaces status err-disabled
The Punt adjacency
Switch(config)#errdisable recovery cause {all | {cause-name}}

21. What are the duplex modes of a GigaStack GBIC?
Switch#show running-config interface {interface}
Static access
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
CEF punt

22. What is the DTP negotiation mode of a switch port configured as static access?
Switch(config)#errdisable recovery interval {seconds}
Off
Switched virtual interface (SVI)
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

23. Displays dynamic CAM table entries
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
25 metres
Electromagnetic Interference
Switch(config)#errdisable detect cause channel-misconfig

24. What is the standard for 1000BASE-T?
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#mac address-table aging-time {seconds}
Switch(config-if)#shutdown
IEEE 802.3ab

25. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
Enable error-disable for all possible causes
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
The CEF epoch number
Static access - trunk - tunnel or dynamic

26. Displays static CAM table entries
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Null adjacency
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#errdisable detect cause storm-control

27. What is the standard for Fast Ethernet (100 Mbps)?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
The switch port falls back to default setting of half duplex
Switch(config-if)#duplex {auto | full | half}
IEEE 802.3u

28. What is an interface-range macro?
A name assigned to a ranges of interfaces
On
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)
400 metres half duplex and 2000 metres full duplex

29. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
A three-fold combination of 0 - 1 and X (don't care)
Configure the appropriate values manually on both ends of the link
With a mask value in addition to binary values to decide which keys in a table are relevant

30. What is full duplex operation?
On
SVI
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

31. Adds a static entry to the MAC address table
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Numeric values that represent what action to take after the TCAM lookup occurs
The Layer 3 forwarding engine
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

32. What is 10GBASE-LX4/LW4?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
IEEE 802.3u
LC - MT-RJ or RJ-45
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

33. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Enable error-disable for all possible causes
The switch port falls back to default setting of half duplex
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

34. What is 10GBASE-X?
Cabling specifications for 10 Gigabit Ethernet
Half duplex
Tunnel
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

35. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Switch#show interfaces status err-disabled
The Drop adjacency
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show cef drop

36. Adds a description to an interface configuration
Enable error-disable for all possible causes
A name assigned to a ranges of interfaces
Packets that have been truncated before they were fully received
Switch(config-if)#description {string}

37. What is the operational mode of a switch port that is a member of one VLAN?
Static access
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Switch(config)#errdisable detect cause storm-control
Partition and tune the TCAM on some Catalyst switches into areas for different functions

38. What CEF adjacency is used to discard packets because of access list or other policy action?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
The Drop adjacency
The Discard adjacency

39. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch(config-if)#switchport mode access
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#errdisable detect cause security-violation

40. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
R = LAN PHY; W = WAN PHY
Switch(config)#errdisable detect cause security-violation
Switched virtual interface (SVI)

41. Enables error-disable for when the port link state is flapping between the up and down states
IEEE 802.3ab
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Switch(config)#errdisable detect cause link-flap
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

42. What CEF optimisation technique cache FIB entries in switch line cards?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Value - Mask - and Result (VMR)
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Accelerated CEF (aCEF)

43. What is the standard for 10 Gigabit Ethernet (10GbE)?
Switch(config)#interface vlan {vlan-id}
They are dropped (ARP throttling)
IEEE 802.3ae
Switch(config-if)#description {string}

44. What CEF adjacency is used to switch packets destined for the null interface?
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause vmps
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
The Null adjacency

45. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
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
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

46. What are the operational modes of a Layer 2 switched interface?
The Layer 3 engine
The switch port falls back to default setting of half duplex
American National Standards Institute
Down - static access - trunk or tunnel

47. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Static access or trunk
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
SVI
American National Standards Institute

48. What is the maximum cabling distance for 1000BASE-CX?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
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
25 metres
Switch(config)#errdisable detect cause psecure-violation

49. What is the maximum cabling distance for 1000BASE-ZX?
10 km
70 km for 9 micron SMF; 100 km for 8 micron SMF
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#errdisable recovery interval {seconds}

50. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
They are dropped (ARP throttling)
SC or MT-RJ
Source MAC address; Port of arrival; VLAN; Time stamp