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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. Adds a static entry to the MAC address table
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Logical Operation Unit
Switch#show cef drop
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

2. What is the standard for Gigabit Ethernet (1000 Mbps)?
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
IEEE 802.3z
SVI or native routed interface
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

3. What changes are made to packets by the CEF packet rewrite engine just before forwarding?
R = LAN PHY; W = WAN PHY
They are dropped (ARP throttling)
SVI
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

4. What is the maximum cabling distance for Ethernet - Fast Ethernet and Gigabit Ethernet over UTP cabling?
Switch(config-if)#no ip route-cache cef
Switch(config)#errdisable detect cause security-violation
IEEE 802.3ae
100 metres

5. Enables error-disable for rate-limiting of DHCP snooping
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config)#errdisable detect cause dhcp-rate-limit
Value - Mask - and Result (VMR)
Manually by administratively disabling and re-enabling the port

6. When can a switch start to learn source MAC addresses on incoming ports?
The Drop adjacency
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
25 metres
A name assigned to a ranges of interfaces

7. What is 1000BASE-SX?
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
SVI or native routed interface
Creating the VLAN
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

8. Disables CEF operation on an interface
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch(config)#errdisable detect cause ilpower
Switch(config-if)#no ip route-cache cef

9. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Routing table and ARP table
The adjacency table
Switch(config-if)#no switchport
They are dropped (ARP throttling)

10. Enables error-disable for when the port link state is flapping between the up and down states
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF
Off
Switch(config)#errdisable detect cause link-flap
Static access or dynamic

11. Enables error-disable for errors with dynamic ARP inspection
Switch(config)#errdisable detect cause arp-inspection
Creating the VLAN
1 -2 on one end with 3 -6 on the other end
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

12. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
LC - MT-RJ or RJ-45
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
The adjacency table
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

13. What are the duplex modes of a GigaStack GBIC?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
On
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

14. What are the types of layer 3 switched interfaces
SVI or native routed interface
Switch(config)#errdisable detect cause gbic-invalid
CEF glean
Source MAC address; Port of arrival; VLAN; Time stamp

15. What CEF adjacency is used to switch packets destined for the null interface?
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Tunnel
The Null adjacency
With a mask value in addition to binary values to decide which keys in a table are relevant

16. What is the administrative mode of a switch port that is a member of one VLAN?
Trunk
Static access or dynamic
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
XENPAK - X2 - or SFP+

17. Displays static CAM table entries
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Forwarding Information Base
Full duplex only
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

18. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Switch(config)#errdisable detect cause link-flap
Half duplex
Switch(config)#errdisable detect cause rootguard
The CEF entry version number

19. What is the DTP negotiation mode of a switch port configured as trunk?
On
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Process the first packet in a traffic flow to determine the destination
A station must wait its turn to transmit; it can't transmit and receive at the same time

20. What is 1000BASE-LX/LH?
Switch#show running-config interface {interface}
Switch#show cef drop
Switch(config)#errdisable detect cause ilpower
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

21. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Route caching and topology based
The Punt adjacency
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#mac address-table aging-time {seconds}

22. How is the TCAM organised?
Switch(config)#interface vlan {vlan-id}
Route caching and topology based
By Mask/Value - where each unique mask has eight value patterns associated with it
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

23. What is the administrative mode of a switch port that carries traffic for multiple VLANs?
Trunk or dynamic
Switch#show errdisable detect
15 metres
275 metres for 62.5 micron MMF; 550 metres for 50 micron MMF

24. What is a ternary combination?

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25. What is the TCAM Value and Mask for an IP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#no ip cef

26. What tables are maintained by the CEF Layer 3 engine?
Content-Addressable Memory
Routing table and ARP table
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Multilayer Switching

27. Removes entries from the CAM table
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Institute of Electrical and Electronics Engineers
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

28. Specifies the timer for automatic re-enabling of error-disabled ports
Switch(config)#errdisable recovery interval {seconds}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
The CEF epoch number

29. What is 10GBASE-SR/SW?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch#show cef not-cef-switched
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
1 -2 on one end with 3 -6 on the other end

30. What is the maximum cabling distance for 10GBASE-ER/EW?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
40 km
400 metres half duplex and 2000 metres full duplex
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

31. What CEF optimisation replicates the entire FIB table among switch line cards?
Security and QoS ACLs
Distributed CEF (dCEF)
SC or MT-RJ
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

32. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
A three-fold combination of 0 - 1 and X (don't care)
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

33. Displays switch port information for a specified interface
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
IEEE 802.3u
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
Switch#show interfaces {interface} switchport

34. Enables error-disable for the presence of invalid GBIC or SFP modules
IEEE 802.3u
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable detect cause gbic-invalid

35. What Ethernet ports allow for autonegotiation?
Switch(config)#errdisable detect cause rootguard
UTP Fast Ethernet and Gigabit Ethernet
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
In TCAM Value entries

36. Enables error-disable for conditions that trigger port security configured on a port
The CEF entry version number
Switch#show adjacency [{interface}] [summary | detail]
Switch(config)#errdisable detect cause psecure-violation
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

37. Displays interface configuration information
Switch#show running-config interface {interface}
Multilayer Switching
SC fibre optic or RJ-45 UTP
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

38. What is the state of packets that are sent to the CEF Layer 3 engine because of missing Layer 2 next-hop addresses?
Compiling Access Control Entries (ACE) into the TCAM table
CEF glean
1 -2 on one end with 3 -6 on the other end
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

39. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#errdisable detect cause storm-control
The switch port falls back to default setting of half duplex

40. What is 10GBASE-ER/EW?
Electromagnetic Interference
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Static access
Switch(config)#errdisable detect cause security-violation

41. What is the TCAM Value and Mask for an IGMP access list?
Creating the VLAN
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
The Null adjacency

42. What information is recorded in CAM as frames arrive on a switch port?
Cabling specifications for 10 Gigabit Ethernet
Source MAC address; Port of arrival; VLAN; Time stamp
400 metres half duplex and 2000 metres full duplex
Switch#show cef drop

43. What is the TCAM Value and Mask for an Ethernet access list?
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
By Mask/Value - where each unique mask has eight value patterns associated with it
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

44. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Store-and-forward
Static access or dynamic
The Null adjacency

45. What is the name of a Layer 3 physical interface on a switch?
Collision domain
Native routed interface
Forwarding Information Base
The Layer 3 forwarding engine

46. What are the common cabling specifications for Gigabit Ethernet?
1000BASE-T full duplex followed by 1000BASE-T half duplex
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause channel-misconfig
Logical Operation Unit

47. What is 1000BASE-X?
The Layer 3 forwarding engine
The CEF epoch number
Cabling specifications for Gigabit Ethernet
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]

48. What is the standard for Fast Ethernet (100 Mbps)?
SC fibre optic or RJ-45 UTP
IEEE 802.3u
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
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

49. What is the timer range for automatic re-enabling of error-disabled ports?
70 km for 9 micron SMF; 100 km for 8 micron SMF
Switch(config)#mac address-table aging-time {seconds}
Configure the appropriate values manually on both ends of the link
From 30 seconds to 86 -400 seconds (24 hours)

50. What are the 1000BASE-X transceiver module form factors used in Cisco Catalyst switches?
Accelerated CEF (aCEF)
Switch#show running-config interface {interface}
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)