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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 Fast Ethernet (100 Mbps)?
Process the first packet in a traffic flow to determine the destination
IEEE 802.3u
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

2. Enables error-disable for conditions that trigger port security configured on a port
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Switch(config)#errdisable detect cause psecure-violation
A station must wait its turn to transmit; it can't transmit and receive at the same time
R = LAN PHY; W = WAN PHY

3. Specifies the timer for automatic re-enabling of error-disabled ports
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable recovery interval {seconds}
300 seconds
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]

4. What information is recorded in CAM as frames arrive on a switch port?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Source MAC address; Port of arrival; VLAN; Time stamp
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Switch(config)#errdisable detect cause dhcp-rate-limit

5. What is the standard for Gigabit Ethernet (1000 Mbps)?
Carrier Sense Multiple Access Collision Detection
Switch#show errdisable recovery
IEEE 802.3z
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

6. Displays error-disabled recovery timer information
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Native routed interface
Switch#show errdisable recovery
Switch(config)#interface {type}{module}/{number}

7. Displays CEF Punt statistics with number of packets and reason for each line card
IEEE 802.3ab
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch#show cef not-cef-switched

8. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable recovery cause {all | {cause-name}}
XENPAK - X2 - or SFP+

9. What is the maximum cabling distance for 1000BASE-LX/LH?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
A three-fold combination of 0 - 1 and X (don't care)
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

10. What CEF optimisation technique cache FIB entries in switch line cards?
Accelerated CEF (aCEF)
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
15 metres
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

11. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause loopback
In TCAM Value entries
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

12. What combinations are TCAM entries composed of?
Store-and-forward
Cisco Express Forwarding
Value - Mask - and Result (VMR)
ANSI X3T11 FibreChannel

13. What is WAN PHY used for?
CEF punt
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Compiling Access Control Entries (ACE) into the TCAM table

14. What is 10GBASE-ER/EW?
SC fibre optic or RJ-45 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
S = Short; L = Long; E = Extra-long

15. What is 100BASE-T2?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show cef not-cef-switched
The CEF entry version number
They are dropped (ARP throttling)

16. What is the TCAM Value and Mask for an IP access list?
Content-Addressable Memory
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Trunk
Route caching and topology based

17. What is TCAM overflow?
Switch(config)#interface {type}{module}/{number}
100 metres
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config)#errdisable detect cause vmps

18. What is the maximum cabling distance for 10GBASE-SR/SW?
Static access - trunk - tunnel or dynamic
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

19. What is the TCAM Value and Mask for an Ethernet access list?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch(config)#interface range macro {name}

20. What is 1000BASE-ZX?
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
Full duplex only
400 metres half duplex and 2000 metres full duplex
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

21. Displays switch port information for a specified interface
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
The Layer 3 engine
Forwarding Information Base
Switch#show interfaces {interface} switchport

22. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
The table of learned MAC addresses - ports - and VLAN information
10GbE operates only at full duplex
Switch(config-if)#duplex {auto | full | half}
Switch(config)#errdisable detect cause ilpower

23. What is 10BASE-T?
Accelerated CEF (aCEF)
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause gbic-invalid
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

24. What are the operational modes of a Layer 2 switched interface?
Down - static access - trunk or tunnel
Trunk
American National Standards Institute
CEF glean

25. Adds a description to an interface configuration
LC - MT-RJ or RJ-45
Switch(config-if)#description {string}
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
FIB with adjacency table

26. What is 10GBASE-LR/LW?
The Drop adjacency
Switch(config)#errdisable detect cause unicast-flood
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

27. What CEF adjacency is used to discard packets because of access list or other policy action?
The Discard adjacency
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Logical Operation Unit
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

28. What is 1000BASE-T?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause arp-inspection
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

29. Displays CEF Drop statistics with number of packets and reason for each line card
Switch(config-if)#no ip route-cache cef
Switch#show cef drop
Logical Operation Unit
Switch(config-if)#switchport access vlan {vlan}

30. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
SVI
In parallel revealing the best (longest) match in a single table lookup
Tunnel
300 seconds

31. Displays a list of all interfaces in an error-disabled state
Switch#show interfaces status err-disabled
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch#show cef not-cef-switched
They are dropped (ARP throttling)

32. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Process the first packet in a traffic flow to determine the destination

33. What is 1000BASE-X?
ANSI X3T11 FibreChannel
Cabling specifications for Gigabit Ethernet
Switch(config)#interface range macro {name}
Switch(config-if)#speed {10 | 100 | 1000 | auto}

34. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause rootguard
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
American National Standards Institute

35. Resets the configuration of a switch port to its default values
Switch(config)#default interface {interface}
1 -2 on one end with 3 -6 on the other end
400 metres half duplex and 2000 metres full duplex
Source MAC address; Port of arrival; VLAN; Time stamp

36. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch(config)#errdisable detect cause unicast-flood
Switch#show ip cef {interface} [detail]
Security and QoS ACLs
Cabling specifications for Gigabit Ethernet

37. Enables error-disable for when the port link state is flapping between the up and down states
LAN PHY and WAN PHY
Switch(config)#mac address-table aging-time {seconds}
Half duplex
Switch(config)#errdisable detect cause link-flap

38. Displays interface configuration information
Switch#show running-config interface {interface}
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
A three-fold combination of 0 - 1 and X (don't care)
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling

39. What is 10GBASE-SR/SW?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Feature Manager (FM) and Switching Database Manager (SDM)
SVI or native routed interface

40. What happens when autonegotiating of link duplex mode fails on a Fast Ethernet link?
The switch port falls back to default setting of half duplex
CEF glean
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)#shutdown

41. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Collision domain
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

42. What is the name of the CEF engine that maintains routing information in software?
The Layer 3 engine
100 metres
10 km
Compiling Access Control Entries (ACE) into the TCAM table

43. Displays static CAM table entries
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause unicast-flood
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

44. What is TCAM?
Switch(config)#errdisable detect cause vmps
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)
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Ternary Content-Addressable Memory

45. What is the TCAM Value and Mask for an extended IP access list using TCP/UDP?
Switch(config)#errdisable recovery interval {seconds}
Switch#show ip cef
Wide-Wavelength Division Multiplexing
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

46. What information is stored in CAM?
10 km
Partition and tune the TCAM on some Catalyst switches into areas for different functions
CEF glean
The table of learned MAC addresses - ports - and VLAN information

47. What is the DTP negotiation mode of a switch port configured as static access?
S = Short; L = Long; E = Extra-long
Value - Mask - and Result (VMR)
Static access
Off

48. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
Switch#show running-config interface {interface}
Dynamic
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Only temporarily for debugging purposes

49. Selects a switch port interface and enters interface configuration mode
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#interface {type}{module}/{number}
The Discard adjacency

50. Adds a static entry to the MAC address table
10 km
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Static access - trunk - tunnel or dynamic