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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. Enables error-disable for errors with dynamic ARP inspection
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
SVI or native routed interface
Switch(config)#errdisable detect cause arp-inspection
By electrical signalling so that either end of a link can determine what speed the other end is trying to use

2. What is the maximum cabling distance for 10GBASE-CX4?
Switch(config)#errdisable detect cause dtp-flap
Switch(config-if)#switchport access vlan {vlan}
15 metres
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)

3. Selects a switch port interface and enters interface configuration mode
Full duplex
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface {type}{module}/{number}
Trunk

4. Displays static CAM table entries
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show interfaces status err-disabled
S = Short; L = Long; E = Extra-long
300 seconds

5. What is the TCAM Value and Mask for an ICMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Native routed interface
Tunnel
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

6. What is 100BASE-FX?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Source MAC address; Port of arrival; VLAN; Time stamp
Wide-Wavelength Division Multiplexing
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

7. What is the DTP negotiation mode of a switch port configured as static access?
40 km
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
IEEE 802.3u
Off

8. What connectors can be used with GBIC modules?
ANSI X3T11 FibreChannel
SVI or native routed interface
Switch(config)#interface {type}{module}/{number}
SC fibre optic or RJ-45 UTP

9. What information is stored in TCAM?
IEEE 802.3z
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Security and QoS ACLs
They are dropped (ARP throttling)

10. What is 100BASE-TX?
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
The Layer 3 forwarding engine
LOU registers
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

11. Disables a switch port
Switch(config)#errdisable detect cause udld
Switch(config-if)#shutdown
Cabling specifications for 10 Gigabit Ethernet
Trunk or dynamic

12. What are the letters used with 10GBASE-X two-letter suffixes to specify the PHY type?
The table of learned MAC addresses - ports - and VLAN information
R = LAN PHY; W = WAN PHY
The Drop adjacency
The Discard adjacency

13. What is the default duplex mode of a 10 Mbps Ethernet interface?
When one station transmits at the same time as another on a shared medium
Switch#show cef drop
Half duplex
70 km for 9 micron SMF; 100 km for 8 micron SMF

14. Displays the entire Forwarding Information Base (FIB)
Process the first packet in a traffic flow to determine the destination
IEEE 802.3u
Switch#show ip cef
Carrier Sense Multiple Access Collision Detection

15. What CEF adjacency is used to switch packets that can't be forwarded normally?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Ternary Content-Addressable Memory
The Drop adjacency
Static access

16. What is the TCAM Value and Mask for an IP access list?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Half duplex
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

17. Displays CEF Punt statistics with number of packets and reason for each line card
Value - Mask - and Result (VMR)
Distributed CEF (dCEF)
15 metres
Switch#show cef not-cef-switched

18. How are the TCAM Mask/Value pairs evaluated?
In parallel revealing the best (longest) match in a single table lookup
Trunk
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
1 -2 on one end with 3 -6 on the other end

19. Enables error-disable when trunking encapsulation is flapping from one type to another
SVI
Switch(config)#errdisable detect cause dtp-flap
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
IEEE 802.3ae

20. What is 1000BASE-ZX?
S = Short; L = Long; E = Extra-long
From 30 seconds to 86 -400 seconds (24 hours)
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

21. Enables error-disable for rate-limiting of DHCP snooping
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Electromagnetic Interference
Switch(config)#errdisable detect cause dhcp-rate-limit
1 -2 on one end with 3 -6 on the other end

22. What information is recorded in CAM as frames arrive on a switch port?
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
300 seconds
Source MAC address; Port of arrival; VLAN; Time stamp
Route caching and topology based

23. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Switch(config-if)#switchport access vlan {vlan}
Full duplex only
The Drop adjacency
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

24. Enables error-disable for when the port link state is flapping between the up and down states
Switch#show errdisable detect
Cisco Express Forwarding
Switch(config)#errdisable detect cause link-flap
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)

25. Displays the contents of the CAM table
ANSI X3T11 FibreChannel
From 30 seconds to 86 -400 seconds (24 hours)
Value - Mask - and Result (VMR)
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

26. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Switch(config)#no ip cef
The Drop adjacency
S = Short; L = Long; E = Extra-long

27. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
Electromagnetic Interference
The table of learned MAC addresses - ports - and VLAN information
Switch(config)#errdisable detect cause rootguard

28. What are the common cabling specifications for Gigabit Ethernet?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch#show ip cef
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show interfaces {interface}

29. What is the name of a Layer 3 physical interface on a switch?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
10 km
The Layer 3 forwarding engine
Native routed interface

30. What are the types of layer 3 switched interfaces
Tunnel
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
SVI or native routed interface
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

31. When should CEF be disabled?
Switch#show adjacency [{interface}] [summary | detail]
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config-if)#speed {10 | 100 | 1000 | auto}
Only temporarily for debugging purposes

32. What is the TCAM Value and Mask for an IGMP access list?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
From 30 seconds to 86 -400 seconds (24 hours)
On

33. Configures the maximum ageing time for entries in the MAC address table
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
IEEE 802.3
Switch(config)#mac address-table aging-time {seconds}
IEEE 802.3ab

34. What are the operational modes of a Layer 2 switched interface?
Down - static access - trunk or tunnel
Native routed interface
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#no ip cef

35. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#no ip cef
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause gbic-invalid

36. Displays error-disabled detection status
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
Switch#show errdisable detect
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
Switch(config)#errdisable detect cause {all | {cause-name}}

37. How do Layer 2 switches provide isolation between hosts?
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
10GbE operates only at full duplex
S = Short; L = Long; E = Extra-long
Store-and-forward

38. What is the maximum cabling distance for Fast Ethernet over 62.5/125 micron multimode fibre?
In TCAM Value entries
Institute of Electrical and Electronics Engineers
400 metres half duplex and 2000 metres full duplex
Switch#show ip cef

39. Displays interface configuration information
Switch(config)#errdisable detect cause storm-control
Switch#show cef not-cef-switched
On
Switch#show running-config interface {interface}

40. How are ports that are in error-disable state re-enabled by default?
10GbE operates only at full duplex
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
The Layer 3 engine
Manually by administratively disabling and re-enabling the port

41. Removes entries from the CAM table
Static access or trunk
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Half duplex

42. What are the Fast Ethernet autonegotiation selection priorities?
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
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Logical Operation Unit
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)

43. What CEF adjacency is used to switch packets destined for the null interface?
Switch#show interfaces status
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
1000BASE-T full duplex followed by 1000BASE-T half duplex
The Null adjacency

44. Adds a description to an interface configuration
Switch#show adjacency [{interface}] [summary | detail]
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config-if)#description {string}
Switch(config)#errdisable detect cause psecure-violation

45. Sets the speed of a Fast Ethernet or Gigabit Ethernet interface
Switch(config-if)#speed {10 | 100 | 1000 | auto}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
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
The adjacency table

46. What is Fast EtherChannel (FEC)?
Switch(config)#errdisable detect cause storm-control
Numeric values that represent what action to take after the TCAM lookup occurs
SVI or native routed interface
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link

47. What fields are rewritten in hardware before a Layer 3 packet is switched to the to egress queue of a multilayer switch?
CEF glean
Switch(config)#errdisable detect cause rootguard
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
They are dropped (ARP throttling)

48. What are the symptoms of a duplex setting mismatch between two ends of a link?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Interconnecting switches in a campus network
Slow response times - low throughput - runts and other input errors on the switch ports
Switch(config)#errdisable recovery cause {all | {cause-name}}

49. What is TCAM?
Switch#show cef not-cef-switched
The Discard adjacency
R = LAN PHY; W = WAN PHY
Ternary Content-Addressable Memory

50. What is the content of TCAM Result entries?
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Numeric values that represent what action to take after the TCAM lookup occurs
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Switch(config-if)#switchport mode access