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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 the standard for 1000BASE-T?
IEEE 802.3ab
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

2. What is 1000BASE-X?
Electromagnetic Interference
LC - MT-RJ or RJ-45
Cabling specifications for Gigabit Ethernet
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

3. What is 10GBASE-ER/EW?
Process the first packet in a traffic flow to determine the destination
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Security and QoS ACLs
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

4. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch#show errdisable recovery
The Discard adjacency
Multilayer Switching
Switch#show ip cef {interface} [detail]

5. What CEF adjacency is used to discard packets because of access list or other policy action?
Static access or dynamic
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
The Discard adjacency

6. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Store-and-forward
In TCAM Value entries

7. What are the common PMD types for 10 Gigabit Ethernet?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause gbic-invalid
The table of learned MAC addresses - ports - and VLAN information

8. What is 100BASE-T2?
The Null adjacency
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch(config-if)#description {string}
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

9. What is the maximum cabling distance for 10GBASE-LR/LW?
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
The Null adjacency
10 km
IEEE 802.3ab

10. How does topology based switching work?
Switch(config)#interface range macro {name}
Security and QoS ACLs
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
15 metres

11. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
Half duplex
Switch(config)#errdisable detect cause channel-misconfig
Logical Operation Unit

12. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config)#errdisable detect cause channel-misconfig
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config-if)#speed {10 | 100 | 1000 | auto}
They are dropped (ARP throttling)

13. What is the default duplex mode of a 10 Mbps Ethernet interface?
Switch#show ip cef
Switch(config)#errdisable recovery interval {seconds}
25 metres
Half duplex

14. Enables error-disable for errors related to 802.1x security
10 km
Switch(config)#errdisable detect cause security-violation
Switch#show errdisable detect
LAN PHY and WAN PHY

15. What is the operational mode of a switch port that is a member of one VLAN?
LAN PHY and WAN PHY
Static access
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Layer 3 forwarding engine

16. Adds a static entry to the MAC address table
Switch(config-if)#duplex {auto | full | half}
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)#mac address-table static {mac-address} vlan {vlan} interface {interface}
A switch port that has been shut down automatically due to a serious error condition

17. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause dtp-flap
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

18. How are ternary combinations implemented?
CEF punt
10 km
With a mask value in addition to binary values to decide which keys in a table are relevant
10 km

19. What is the maximum cabling distance for 1000BASE-SX?
Switch(config)#errdisable detect cause arp-inspection
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

20. What tables are maintained by the CEF Layer 3 engine?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Routing table and ARP table
Security and QoS ACLs

21. What is the maximum cabling distance for 1000BASE-LX/LH?
Switch#show cef not-cef-switched
Feature Manager (FM) and Switching Database Manager (SDM)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
400 metres half duplex and 2000 metres full duplex

22. What is CSMA/CD?
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable recovery cause {all | {cause-name}}
Carrier Sense Multiple Access Collision Detection
The adjacency table

23. What is 100BASE-FX?
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
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause {all | {cause-name}}
Native routed interface

24. What is TCAM?
The Punt adjacency
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
With a mask value in addition to binary values to decide which keys in a table are relevant
Ternary Content-Addressable Memory

25. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Content-Addressable Memory
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

26. Displays CEF Drop statistics with number of packets and reason for each line card
Routing table and ARP table
Switch#show cef drop
Switch#show interfaces {interface}
Switch#show adjacency [{interface}] [summary | detail]

27. What are the operational modes of a Layer 2 switched interface?
Switch(config-if)#no ip route-cache cef
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Off
Down - static access - trunk or tunnel

28. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Switch(config)#interface {type}{module}/{number}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Institute of Electrical and Electronics Engineers

29. What are the common cabling specifications for Gigabit Ethernet?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Full duplex
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX

30. Displays static CAM table entries
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Ternary Content-Addressable Memory
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
By Mask/Value - where each unique mask has eight value patterns associated with it

31. What is 10GBASE-CX4?
Switch#show cef not-cef-switched
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

32. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config-if)#no switchport
Logical Operation Unit
Switch(config)#errdisable detect cause bpduguard

33. What is the prerequesite for creating a working SVI?
IEEE 802.3ab
Switch(config)#errdisable detect cause link-flap
FIB with adjacency table
Creating the VLAN

34. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
Switch(config)#errdisable detect cause arp-inspection
Enable error-disable for all possible causes
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

35. What is WAN PHY used for?
The Drop adjacency
Manually by administratively disabling and re-enabling the port
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#show interfaces {interface}

36. Disables CEF operation globally
Switch(config)#no ip cef
LOU registers
SC fibre optic or RJ-45 UTP
IEEE 802.3ab

37. What is EMI?
Electromagnetic Interference
1000BASE-T full duplex followed by 1000BASE-T half duplex
Routing table and ARP table
Process the first packet in a traffic flow to determine the destination

38. 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
Dynamic
Switch(config)#errdisable detect cause gbic-invalid
Static access or dynamic

39. What is the maximum cabling distance for 10GBASE-CX4?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
15 metres
SC fibre optic or RJ-45 UTP
IEEE 802.3z

40. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Cabling specifications for 10 Gigabit Ethernet
On
10 km
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

41. What is the timer range for automatic re-enabling of error-disabled ports?
Value - Mask - and Result (VMR)
From 30 seconds to 86 -400 seconds (24 hours)
The Drop adjacency
Switch(config)#errdisable detect cause vmps

42. Enables error-disable for conditions that trigger unicast flood blocking on a port
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause unicast-flood
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Packets that have been truncated before they were fully received

43. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
IEEE 802.3z
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
SVI

44. What CEF adjacency is used to switch packets that can't be forwarded normally?
The Drop adjacency
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Dynamic
Switch(config-if)#switchport mode access

45. Displays a list of all interfaces in an error-disabled state
Switch#show ip cef
Switch(config-if)#duplex {auto | full | half}
Switch#show interfaces {interface}
Switch#show interfaces status err-disabled

46. What happens to subsequent packets destined for FIB entries in CEF glean state?
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
They are dropped (ARP throttling)
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

47. What two IOS software components are involved in TCAM operation?
Switch#show interfaces status err-disabled
Feature Manager (FM) and Switching Database Manager (SDM)
Compiling Access Control Entries (ACE) into the TCAM table
IEEE 802.3u

48. What is the role of a Route Processor (RP) in first generation MLS?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
A three-fold combination of 0 - 1 and X (don't care)
Process the first packet in a traffic flow to determine the destination
Switch#show interfaces status err-disabled

49. Selects multiple switch port interfaces at the same time and enters interface configuration mode
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
LOU registers
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]

50. What is the maximum cabling distance for 10GBASE-ER/EW?
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
100 metres
Carrier Sense Multiple Access Collision Detection
40 km