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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 1000BASE-SX?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
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
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Dynamic

2. What is CAM?
Off
Security and QoS ACLs
Content-Addressable Memory
Switch(config)#errdisable detect cause storm-control

3. Displays the CAM table size with number of MAC addresses
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
40 km
S = Short; L = Long; E = Extra-long
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

4. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch#show cef drop
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Switch(config)#errdisable detect cause bpduguard
A three-fold combination of 0 - 1 and X (don't care)

5. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Value - Mask - and Result (VMR)
A switch port that has been shut down automatically due to a serious error condition
100 metres

6. What two IOS software components are involved in TCAM operation?
Switch#show cef drop
Switch(config)#errdisable detect cause l2ptguard
Feature Manager (FM) and Switching Database Manager (SDM)
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

7. What is the TCAM Value and Mask for an IPX access list?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable recovery interval {seconds}
Accelerated CEF (aCEF)
Ternary Content-Addressable Memory

8. What denotes the number of times the CEF table has been flushed and regenerated as a whole?
The CEF epoch number
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

9. What is the name of physical network segment where data packets can collide with one another when being sent?
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Cabling specifications for 10 Gigabit Ethernet
Collision domain
SVI

10. What is 10GBASE-CX4?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Packets that have been truncated before they were fully received
Trunk or dynamic
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

11. What are the letters used with 10GBASE-X two-letter suffixes to specify the transceiver wavelengths?
S = Short; L = Long; E = Extra-long
Switch#show ip cef {interface} [detail]
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Ternary Content-Addressable Memory

12. What is the content of TCAM Result entries?
Numeric values that represent what action to take after the TCAM lookup occurs
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
S = Short; L = Long; E = Extra-long

13. What is the role of a Route Processor (RP) in first generation MLS?
Switch(config)#errdisable detect cause psecure-violation
Process the first packet in a traffic flow to determine the destination
Security and QoS ACLs
Switch#show interfaces {interface} switchport

14. What are the Gigabit Ethernet autonegotiation selection priorities?
10 km
1000BASE-T full duplex followed by 1000BASE-T half duplex
IEEE 802.3z
Security and QoS ACLs

15. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
CEF punt
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
S = Short; L = Long; E = Extra-long

16. What happens to subsequent packets destined for FIB entries in CEF glean state?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config)#errdisable detect cause dtp-flap
400 metres half duplex and 2000 metres full duplex
They are dropped (ARP throttling)

17. What is the maximum cabling distance for 1000BASE-ZX?
1 -2 on one end with 3 -6 on the other end
The Layer 3 engine
70 km for 9 micron SMF; 100 km for 8 micron SMF
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

18. What is 10GBASE-X?
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
25 metres
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Cabling specifications for 10 Gigabit Ethernet

19. What are the operational modes of a Layer 2 switched 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)
Down - static access - trunk or tunnel
Multilayer Switching
Numeric values that represent what action to take after the TCAM lookup occurs

20. Disables CEF operation globally
Switch(config)#no ip cef
Trunk or dynamic
Native routed interface
Enable error-disable for all possible causes

21. What is the TCAM Value and Mask for an ICMP access list?
Accelerated CEF (aCEF)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

22. What are the types of layer 3 switched interfaces
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause vmps
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
SVI or native routed interface

23. What connectors can be used with SFP modules?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
LC - MT-RJ or RJ-45
Switch(config-if)#switchport access vlan {vlan}
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling

24. Creates a switched virtual interface (SVI) and enters interface configuration mode
Switch(config)#interface vlan {vlan-id}
UTP Fast Ethernet and Gigabit Ethernet
Static access - trunk - tunnel or dynamic
Half duplex

25. What information is recorded in CAM as frames arrive on a switch port?
IEEE 802.3u
IEEE 802.3z
Source MAC address; Port of arrival; VLAN; Time stamp
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)

26. What tables are maintained by the CEF Layer 3 forwarding engine?
Switch(config-if)#no ip route-cache cef
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config)#errdisable detect cause link-flap
FIB with adjacency table

27. What is FIB?
When one station transmits at the same time as another on a shared medium
Switch(config)#errdisable detect cause pagp-flap
Forwarding Information Base
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

28. What combinations are TCAM entries composed of?
IEEE 802.3ab
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Security and QoS ACLs
Value - Mask - and Result (VMR)

29. Configures a switch port with a static access VLAN assignment
Switch(config-if)#switchport access vlan {vlan}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
SVI

30. What is the operational mode of a switch port that carries traffic for multiple VLANs?
A name assigned to a ranges of interfaces
Trunk
Switch(config)#mac address-table aging-time {seconds}
Configure the appropriate values manually on both ends of the link

31. What is the prerequesite for creating a working SVI?
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)
Creating the VLAN
Multilayer Switching
Forwarding Information Base

32. Enables error-disable for when the port link state is flapping between the up and down states
Cabling specifications for 10 Gigabit Ethernet
Distributed CEF (dCEF)
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#errdisable detect cause link-flap

33. What is 10GBASE-SR/SW?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
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

34. How is the TCAM organised?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
By Mask/Value - where each unique mask has eight value patterns associated with it
Security and QoS ACLs
Configure the appropriate values manually on both ends of the link

35. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause ilpower
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Static access or dynamic
Switch(config)#errdisable detect cause arp-inspection

36. What denotes the number of times a CEF entry has been updated since the CEF table was created?
From 30 seconds to 86 -400 seconds (24 hours)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
The CEF entry version number
Tunnel

37. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
With a mask value in addition to binary values to decide which keys in a table are relevant
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
Switch(config-if)#no switchport
Numeric values that represent what action to take after the TCAM lookup occurs

38. What is the maximum cabling distance for 1000BASE-SX?
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable recovery cause {all | {cause-name}}

39. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config-if)#no ip route-cache cef
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
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)

40. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause {all | {cause-name}}
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause gbic-invalid
70 km for 9 micron SMF; 100 km for 8 micron SMF

41. Adds a description to an interface configuration
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch(config-if)#description {string}
LC - MT-RJ or RJ-45
S = Short; L = Long; E = Extra-long

42. What are the names of the two basic generations of MLS?
Route caching and topology based
Dynamic
Switch(config-if)#switchport access vlan {vlan}
Half duplex

43. Displays CEF Punt statistics with number of packets and reason for each line card
Electromagnetic Interference
LC - MT-RJ or RJ-45
Switch#show cef not-cef-switched
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

44. Removes entries from the CAM table
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

45. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause dhcp-rate-limit
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
On
Switch(config-if)#shutdown

46. When can a switch start to learn source MAC addresses on incoming ports?
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Tunnel
Static access
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

47. Resets the configuration of a switch port to its default values
The CEF entry version number
Switch(config-if)#no switchport
Switch(config)#default interface {interface}
Wide-Wavelength Division Multiplexing

48. What is the name of a Layer 3 logical interface on a switch that represents an entire VLAN?
Electromagnetic Interference
Static access - trunk - tunnel or dynamic
SVI
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

49. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch(config)#errdisable detect cause vmps
25 metres

50. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Multilayer Switching
Switch(config-if)#switchport mode access
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
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