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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 10GBASE-CX4?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
SVI or native routed interface
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

2. What is the default duplex mode of a Fast Ethernet interface?
Half duplex
From 30 seconds to 86 -400 seconds (24 hours)
Slow response times - low throughput - runts and other input errors on the switch ports
100 metres

3. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
40 km
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

4. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
25 metres
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config)#errdisable detect cause link-flap

5. What is the timer range for automatic re-enabling of error-disabled ports?
400 metres half duplex and 2000 metres full duplex
Slow response times - low throughput - runts and other input errors on the switch ports
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config)#errdisable detect cause channel-misconfig

6. What is 10GBASE-LR/LW?
300 seconds
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

7. What denotes the number of times a CEF entry has been updated since the CEF table was created?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#errdisable detect cause ilpower
The CEF entry version number

8. What is the standard for 10 Gigabit Ethernet (10GbE)?
A station must wait its turn to transmit; it can't transmit and receive at the same time
IEEE 802.3ae
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Accelerated CEF (aCEF) and Distributed CEF (dCEF)

9. What is TCAM overflow?
The Drop adjacency
Trunk or dynamic
Ternary Content-Addressable Memory
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

10. Displays static CAM table entries
Switch(config)#errdisable detect cause security-violation
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

11. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
LOU registers
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)
ANSI X3T11 FibreChannel

12. Displays CEF adjacency table information
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Static access or dynamic
Switch#show adjacency [{interface}] [summary | detail]

13. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause bpduguard
Content-Addressable Memory
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

14. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
R = LAN PHY; W = WAN PHY
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Accelerated CEF (aCEF)
Switch(config)#errdisable detect cause storm-control

15. Enables error-disable for errors related to 802.1x security
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause security-violation
25 metres
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

16. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
From 30 seconds to 86 -400 seconds (24 hours)
Ternary Content-Addressable Memory
Store-and-forward

17. What is 100BASE-TX?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Distributed CEF (dCEF)
The Layer 3 forwarding engine
SC or MT-RJ

18. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
When one station transmits at the same time as another on a shared medium
Dynamic
100 metres
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

19. What is the DTP negotiation mode of a switch port configured as static access?
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)
Off
LAN PHY and WAN PHY

20. How does topology based switching work?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#interface vlan {vlan-id}
CEF punt
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

21. What is WAN PHY used for?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Forwarding Information Base
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Dynamic

22. When should CEF be disabled?
Switch(config)#errdisable detect cause l2ptguard
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause loopback
Only temporarily for debugging purposes

23. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Numeric values that represent what action to take after the TCAM lookup occurs
Route caching and topology based
Switch(config-if)#no switchport
Collision domain

24. What is the maximum cabling distance for 10GBASE-CX4?
Feature Manager (FM) and Switching Database Manager (SDM)
They are dropped (ARP throttling)
Switch(config)#default interface {interface}
15 metres

25. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
10GbE operates only at full duplex
Switch(config)#no ip cef
Switch(config)#interface range macro {name}

26. What is the administrative mode of a switch port that is a member of one VLAN?
10 km
Static access or dynamic
Forwarding Information Base
The Discard adjacency

27. What information is recorded in CAM as frames arrive on a switch port?
Switch(config)#errdisable recovery interval {seconds}
LOU registers
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Source MAC address; Port of arrival; VLAN; Time stamp

28. Displays CEF Punt statistics with number of packets and reason for each line card
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show cef not-cef-switched
A station must wait its turn to transmit; it can't transmit and receive at the same time
Wide-Wavelength Division Multiplexing

29. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
The CEF epoch number
10 km
Switch(config)#errdisable recovery interval {seconds}
Switch#show errdisable detect

30. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
Trunk or dynamic
The adjacency table
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
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

31. 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
Routing table and ARP table
Route caching and topology based
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

32. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
400 metres half duplex and 2000 metres full duplex
IEEE 802.3z
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
On

33. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
The Drop adjacency
Switch#show running-config interface {interface}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

34. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Switch(config)#interface vlan {vlan-id}
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
Store-and-forward
S = Short; L = Long; E = Extra-long

35. What packets are immediately sent to the CEF Layer 3 engine for further processing?

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36. Adds a description to an interface configuration
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Configure the appropriate values manually on both ends of the link
Switch(config-if)#description {string}

37. Enables error-disable for the presence of invalid GBIC or SFP modules
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause gbic-invalid
Dynamic
A switch port that has been shut down automatically due to a serious error condition

38. Displays a list with status of all interfaces
Cabling specifications for Gigabit Ethernet
Switch(config)#mac address-table aging-time {seconds}
SC fibre optic or RJ-45 UTP
Switch#show interfaces status

39. What is the maximum cabling distance for 1000BASE-CX?
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause l2ptguard
Switch#show cef drop
25 metres

40. Enables error-disable for errors with offering inline power
Switch(config)#errdisable detect cause l2ptguard
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#errdisable detect cause ilpower
IEEE 802.3ae

41. What are the Fast Ethernet autonegotiation selection priorities?
Numeric values that represent what action to take after the TCAM lookup occurs
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
Institute of Electrical and Electronics Engineers
Switch(config)#default interface {interface}

42. Enables error-disable for misconfiguration of EtherChannel bundles
Switch(config)#errdisable detect cause channel-misconfig
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause ilpower

43. What is the maximum cabling distance for 1000BASE-ZX?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Static access or dynamic
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
The Layer 3 forwarding engine

44. What is the default duplex mode of a Gigabit Ethernet interface?
The Discard adjacency
Full duplex
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch#show errdisable detect

45. What is 10GBASE-ER/EW?
Native routed interface
In parallel revealing the best (longest) match in a single table lookup
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Wide-Wavelength Division Multiplexing

46. What is the TCAM Value and Mask for an IP access list?
On
Switch#show errdisable recovery
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config-if)#shutdown

47. Sets the administrative mode of a switch port to access
Switch(config)#errdisable detect cause link-flap
Static access
Switch(config-if)#switchport mode access
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

48. Enables error-disable when trunking encapsulation is flapping from one type to another
Switch(config)#errdisable detect cause dtp-flap
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)
Cabling specifications for 10 Gigabit Ethernet
Switch(config)#no ip cef

49. What is the standard for 1000BASE-T?
In TCAM Value entries
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
A three-fold combination of 0 - 1 and X (don't care)
IEEE 802.3ab

50. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Switch(config)#errdisable detect cause ilpower
Only temporarily for debugging purposes
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
UTP Fast Ethernet and Gigabit Ethernet