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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 CEF Drop statistics with number of packets and reason for each line card
Switch(config-if)#switchport access vlan {vlan}
SVI or native routed interface
Switch#show cef drop
Creating the VLAN

2. What is the prerequesite for creating a working SVI?
Switch(config)#errdisable detect cause rootguard
A switch port that has been shut down automatically due to a serious error condition
Creating the VLAN
Switch#show interfaces status

3. What are the symptoms of a duplex setting mismatch between two ends of a link?
Logical Operation Unit
Slow response times - low throughput - runts and other input errors on the switch ports
CEF punt
10 km

4. Sets the administrative mode of a switch port to access
The Punt adjacency
Switch(config-if)#switchport mode access
Route caching and topology based
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

5. What function is performed by the Feature Manager (FM)?
Full duplex
Compiling Access Control Entries (ACE) into the TCAM 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
In TCAM Value entries

6. What are the common cabling specifications for Fast Ethernet?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause gbic-invalid
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

7. What is the administrative mode of a switch port that is a member of one VLAN?
Full duplex
Static access or dynamic
In TCAM Value entries
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

8. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
From 30 seconds to 86 -400 seconds (24 hours)
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
The Discard adjacency
Switch#show cef drop

9. Resets the configuration of a switch port to its default values
Electromagnetic Interference
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Static access or dynamic
Switch(config)#default interface {interface}

10. What is error-disable state?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Tunnel
In TCAM Value entries
A switch port that has been shut down automatically due to a serious error condition

11. What is EMI?
Switch(config)#errdisable detect cause udld
Electromagnetic Interference
On
Switch(config)#errdisable recovery interval {seconds}

12. What is the maximum cabling distance for 1000BASE-SX?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Trunk
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Static access or trunk

13. What is 10GBASE-LR/LW?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
40 km
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause ilpower

14. Enables error-disable when a link is seen to be unidirectional
Switch(config)#errdisable detect cause udld
Static access - trunk - tunnel or dynamic
They are dropped (ARP throttling)
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

15. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
Interconnecting switches in a campus network
ANSI X3T11 FibreChannel
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

16. What is 10BASE-T?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
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
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

17. What is the operational mode of a switch port that is a member of one VLAN?
Switch(config)#errdisable detect cause loopback
70 km for 9 micron SMF; 100 km for 8 micron SMF
By Mask/Value - where each unique mask has eight value patterns associated with it
Static access

18. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch#show ip cef
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
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

19. What is 1000BASE-T?
Switch(config)#errdisable detect cause udld
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Static access or trunk
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

20. When should CEF be disabled?
Only temporarily for debugging purposes
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Static access or trunk
Switch(config)#errdisable detect cause gbic-invalid

21. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
ANSI X3T11 FibreChannel
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Route caching and topology based
Switch(config-if)#switchport mode access

22. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause unicast-flood
Distributed CEF (dCEF)
SC or MT-RJ

23. What is 100BASE-T4?
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
From 30 seconds to 86 -400 seconds (24 hours)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Switch(config)#errdisable detect cause arp-inspection

24. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Store-and-forward
Switch(config)#errdisable detect cause security-violation
ANSI X3T11 FibreChannel

25. What information is stored in CAM?
Switch(config)#interface range macro {name}
Switch(config)#errdisable recovery cause {all | {cause-name}}
The table of learned MAC addresses - ports - and VLAN information
Carrier Sense Multiple Access Collision Detection

26. What is the default age-out time for stale entries in the CAM table?
300 seconds
R = LAN PHY; W = WAN PHY
On
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

27. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
40 km
Switch(config)#errdisable detect cause arp-inspection
The adjacency table

28. What connectors can be used with GBIC modules?
SC fibre optic or RJ-45 UTP
Configure the appropriate values manually on both ends of the link
Switch(config-if)#switchport access vlan {vlan}
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

29. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
Switch(config-if)#switchport mode access
Source MAC address; Port of arrival; VLAN; Time stamp
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

30. Disables a switch port
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config-if)#shutdown
LOU registers

31. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In TCAM Value entries
Switch(config)#errdisable detect cause arp-inspection
Trunk or dynamic
Native routed interface

32. What are the names of the two basic generations of MLS?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
LC - MT-RJ or RJ-45
Route caching and topology based
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

33. Displays the contents of the CAM table
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Logical Operation Unit

34. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Forwarding Information Base
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause dtp-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

35. Disables CEF operation on an interface
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)
Switch(config-if)#no ip route-cache cef
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
On

36. What is the standard for 10 Gigabit Ethernet (10GbE)?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
IEEE 802.3ae
Only temporarily for debugging purposes
LOU registers

37. Sets the duplex mode of an Ethernet or Fast Ethernet interface
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause l2ptguard
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
Source MAC address; Port of arrival; VLAN; Time stamp

38. What is the role of a Route Processor (RP) in first generation MLS?
Process the first packet in a traffic flow to determine the destination
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Forwarding Information Base
A name assigned to a ranges of interfaces

39. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
SVI
Full duplex only
Switch(config-if)#no switchport
Switch#show adjacency [{interface}] [summary | detail]

40. What is the DTP negotiation mode of a switch port configured as trunk?
The adjacency table
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
On
XENPAK - X2 - or SFP+

41. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
A switch port that has been shut down automatically due to a serious error condition
Switch(config-if)#shutdown
Switch#show interfaces {interface} switchport

42. What are the Gigabit Ethernet autonegotiation selection priorities?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch#show interfaces {interface} switchport
1000BASE-T full duplex followed by 1000BASE-T half duplex
A three-fold combination of 0 - 1 and X (don't care)

43. What is the default duplex mode of a 10 Mbps Ethernet interface?
In parallel revealing the best (longest) match in a single table lookup
Half duplex
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause l2ptguard

44. How does topology based switching work?
Feature Manager (FM) and Switching Database Manager (SDM)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Interconnecting switches in a campus network
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

45. What is the maximum cabling distance for 10GBASE-ER/EW?
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause loopback
40 km
LOU registers

46. What CEF optimisation replicates the entire FIB table among switch line cards?
Distributed CEF (dCEF)
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Multilayer Switching
CEF punt

47. What is unknown unicast flooding?
IEEE 802.3ae
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch#show ip cef

48. What are the operational modes of a Layer 2 switched interface?
ANSI X3T11 FibreChannel
Switch(config)#errdisable detect cause rootguard
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
Down - static access - trunk or tunnel

49. What is 1000BASE-CX?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch#show errdisable recovery
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Value - Mask - and Result (VMR)

50. What are the names of CEF optimisation techniques using specialised forwarding hardware?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]