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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 IEEE?
Institute of Electrical and Electronics Engineers
100 metres
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

2. What is the standard for 10 Gigabit Ethernet (10GbE)?
Off
Logical Operation Unit
25 metres
IEEE 802.3ae

3. What is Cisco's old recommendation regarding switch port speed and duplex mode?
Value - Mask - and Result (VMR)
Configure the appropriate values manually on both ends of the link
Numeric values that represent what action to take after the TCAM lookup occurs
A three-fold combination of 0 - 1 and X (don't care)

4. What are the administrative modes of Layer 2 switched interfaces?
Full duplex
Packets that have been truncated before they were fully received
Switch(config)#errdisable detect cause security-violation
Static access - trunk - tunnel or dynamic

5. Displays switch port information for a specified interface
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Switch#show interfaces {interface} switchport
Only temporarily for debugging purposes
100 metres

6. What is the name of a Layer 3 physical interface on a switch?
Switch(config)#errdisable detect cause pagp-flap
Native routed interface
Content-Addressable Memory
Security and QoS ACLs

7. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
100 metres
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Cabling specifications for Gigabit Ethernet
The Discard adjacency

8. Displays the contents of the CAM table
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
The Layer 3 engine
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
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

9. What is the maximum cabling distance for 1000BASE-LX/LH?
Routing table and ARP table
100 metres
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

10. What tables are maintained by the CEF Layer 3 engine?
Tunnel
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Routing table and ARP table
Feature Manager (FM) and Switching Database Manager (SDM)

11. What is the default duplex mode of a Fast Ethernet interface?
Full duplex only
Switch(config)#errdisable detect cause dtp-flap
Half duplex
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

12. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Store-and-forward
The Punt adjacency
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

13. What information is stored in TCAM?
IEEE 802.3
Security and QoS ACLs
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config-if)#switchport mode access

14. What is 1000BASE-SX?
25 metres
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
The Punt adjacency

15. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Down - static access - trunk or tunnel
The CEF entry version number
Switch#show cef not-cef-switched
Switch(config)#errdisable detect cause pagp-flap

16. What is half duplex operation?

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17. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
Trunk or dynamic
Switch(config)#errdisable detect cause psecure-violation
ANSI X3T11 FibreChannel

18. What are the common PMD types for 10 Gigabit Ethernet?
Switch(config)#errdisable detect cause loopback
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

19. What is EMI?
Switch(config)#errdisable detect cause arp-inspection
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Electromagnetic Interference

20. What is 100BASE-FX?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
SC or MT-RJ
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

21. Adds a static entry to the MAC address table
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
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 IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

22. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Off
10 km
Switch#show interfaces status err-disabled

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

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24. What is the operational mode of a switch port that uses DTP negotiation?
Switch(config-if)#shutdown
1000BASE-T full duplex followed by 1000BASE-T half duplex
Static access or trunk
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

25. What is the TCAM Value and Mask for an IPX access list?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show errdisable detect
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

26. Displays the entire Forwarding Information Base (FIB)
When one station transmits at the same time as another on a shared medium
Switch#show ip cef
ANSI X3T11 FibreChannel
IEEE 802.3ab

27. What is error-disable state?
A switch port that has been shut down automatically due to a serious error condition
Switch(config)#interface vlan {vlan-id}
XENPAK - X2 - or SFP+
Switch#show cef drop

28. What is the maximum cabling distance for 10GBASE-ER/EW?
40 km
XENPAK - X2 - or SFP+
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 CEF epoch number

29. What is TCAM?
Switch(config)#interface vlan {vlan-id}
Ternary Content-Addressable Memory
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
70 km for 9 micron SMF; 100 km for 8 micron SMF

30. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Switch(config)#errdisable detect cause storm-control
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
The Discard adjacency

31. What is the maximum cabling distance for 1000BASE-SX?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
LOU registers
Switch(config)#errdisable detect cause storm-control

32. Displays static CAM table entries
Full duplex
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
The switch port falls back to default setting of half duplex

33. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch(config)#errdisable detect cause bpduguard
Switch(config)#errdisable detect cause ilpower
Static access
Switch#show interfaces {interface}

34. What is unknown unicast flooding?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Switch(config)#errdisable detect cause link-flap
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

35. Resets the configuration of a switch port to its default values
Switch(config)#errdisable detect cause vmps
Switch(config)#default interface {interface}
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
When one station transmits at the same time as another on a shared medium

36. What is 10GBASE-X?
Feature Manager (FM) and Switching Database Manager (SDM)
Cabling specifications for 10 Gigabit Ethernet
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

37. What is WAN PHY used for?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#show running-config interface {interface}
Numeric values that represent what action to take after the TCAM lookup occurs

38. What is a ternary combination?

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39. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Compiling Access Control Entries (ACE) into the TCAM table
Process the first packet in a traffic flow to determine the destination
IEEE 802.3ab

40. What is 100BASE-T4?
Static access
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

41. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
The Discard adjacency
CEF punt
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

42. What information is stored in CAM?
Collision domain
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
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)
The table of learned MAC addresses - ports - and VLAN information

43. What is 10GBASE-CX4?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause ilpower
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show ip cef {interface} [detail]

44. Selects a switch port interface and enters interface configuration mode
Switch(config)#interface {type}{module}/{number}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause {all | {cause-name}}
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

45. What is an interface-range macro?
Switch(config)#errdisable detect cause {all | {cause-name}}
A name assigned to a ranges of interfaces
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

46. What is 10GBASE-LX4/LW4?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Routing table and ARP table
Compiling Access Control Entries (ACE) into the TCAM table

47. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
On
Switch(config)#errdisable detect cause channel-misconfig
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

48. What is TCAM overflow?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
The table of learned MAC addresses - ports - and VLAN information
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch#show interfaces status

49. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Enable error-disable for all possible causes
Native routed interface
Switch(config)#errdisable detect cause vmps
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. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable detect cause {all | {cause-name}}
Routing table and ARP table