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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 TCAM Value and Mask for an IPX access list?
Trunk or dynamic
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
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)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

2. What is 100BASE-TX?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]

3. What is the TCAM Value and Mask for an Ethernet access list?
Configure the appropriate values manually on both ends of the link
Distributed CEF (dCEF)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show cef drop

4. What connectors can be used with GBIC modules?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
SC fibre optic or RJ-45 UTP
The switch port falls back to default setting of half duplex

5. What is the maximum cabling distance for 10GBASE-LX4/LW4?
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum
300 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch#show cef drop

6. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
ANSI X3T11 FibreChannel
On
Switch(config)#errdisable detect cause unicast-flood

7. Enables error-disable for misconfiguration of EtherChannel bundles
Switch#show ip cef
Carrier Sense Multiple Access Collision Detection
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Switch(config)#errdisable detect cause channel-misconfig

8. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
In parallel revealing the best (longest) match in a single table lookup
Static access or dynamic
IEEE 802.3u

9. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#interface {type}{module}/{number}
Store-and-forward
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)

10. Displays a list of all interfaces in an error-disabled state
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
IEEE 802.3
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch#show interfaces status err-disabled

11. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause bpduguard
S = Short; L = Long; E = Extra-long
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

12. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Switch(config)#errdisable detect cause unicast-flood
LAN PHY and WAN PHY
Switch(config)#errdisable recovery interval {seconds}
Static access

13. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause storm-control
Switch(config)#interface range macro {name}

14. What tables are maintained by the CEF Layer 3 forwarding engine?
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Switch#show interfaces {interface}
SC fibre optic or RJ-45 UTP
FIB with adjacency table

15. Enables error-disable for errors with offering inline power
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause ilpower
Switch(config-if)#shutdown
Static access - trunk - tunnel or dynamic

16. Displays switch port information for a specified interface
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch#show errdisable detect
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Switch#show interfaces {interface} switchport

17. What are the default error-disable detection causes?
Switch#show ip cef {interface} [detail]
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Enable error-disable for all possible causes

18. What CEF optimisation replicates the entire FIB table among switch line cards?
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Distributed CEF (dCEF)

19. How does topology based switching work?
Electromagnetic Interference
Switch(config)#errdisable detect cause gbic-invalid
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
They are dropped (ARP throttling)

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

21. Enables error-disable for rate-limiting of DHCP snooping
Trunk
Tunnel
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#errdisable detect cause dhcp-rate-limit

22. What is unknown unicast flooding?
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
Source MAC address; Port of arrival; VLAN; Time stamp
Static access or trunk
A station must wait its turn to transmit; it can't transmit and receive at the same time

23. Enables error-disable for errors with dynamic ARP inspection
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#errdisable detect cause arp-inspection
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
IEEE 802.3ab

24. What are runts?
Switch(config)#errdisable recovery interval {seconds}
Switch#show adjacency [{interface}] [summary | detail]
Packets that have been truncated before they were fully received
Switch(config)#errdisable detect cause channel-misconfig

25. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Switch(config)#errdisable detect cause l2ptguard
Store-and-forward
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Manually by administratively disabling and re-enabling the port

26. How is the TCAM organised?
Only temporarily for debugging purposes
Switch(config)#errdisable detect cause vmps
By Mask/Value - where each unique mask has eight value patterns associated with it
Interconnecting switches in a campus network

27. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Routing table and ARP table
The Drop adjacency

28. What is 100BASE-T2?
From 30 seconds to 86 -400 seconds (24 hours)
Wide-Wavelength Division Multiplexing
IEEE 802.3z
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP

29. What is LOU?
40 km
Security and QoS ACLs
Route caching and topology based
Logical Operation Unit

30. What is the standard for Gigabit Ethernet (1000 Mbps)?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
IEEE 802.3z
100 metres
Switch(config)#no ip cef

31. What is the prerequesite for creating a working SVI?
Switch#show errdisable detect
From 30 seconds to 86 -400 seconds (24 hours)
Creating the VLAN
Process the first packet in a traffic flow to determine the destination

32. What are the operational modes of a Layer 2 switched interface?
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Down - static access - trunk or tunnel
Electromagnetic Interference
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

33. When can a switch start to learn source MAC addresses on incoming ports?
Static access
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Store-and-forward
Feature Manager (FM) and Switching Database Manager (SDM)

34. What is half duplex operation?

35. How do Layer 2 switches provide isolation between hosts?
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Static access or trunk
Configure the appropriate values manually on both ends of the link

36. What is the TCAM Value and Mask for an IGMP access list?
Switch(config)#errdisable detect cause udld
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Switch(config)#errdisable detect cause vmps
Creating the VLAN

37. What is the maximum cabling distance for Fast Ethernet over singlemode fibre?
Switch(config)#errdisable detect cause security-violation
10 km
XENPAK - X2 - or SFP+
Switch#show interfaces {interface}

38. What CEF adjacency is used to switch packets that can't be forwarded normally?
10 km
The Drop adjacency
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

39. What information is stored in CAM?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Switch(config)#interface {type}{module}/{number}
With a mask value in addition to binary values to decide which keys in a table are relevant
The table of learned MAC addresses - ports - and VLAN information

40. What are the symptoms of a duplex setting mismatch between two ends of a link?
Slow response times - low throughput - runts and other input errors on the switch ports
On
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
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

41. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
Switch(config)#interface range macro {name}
With a mask value in addition to binary values to decide which keys in a table are relevant
Off
LOU registers

42. Enables error-disable for the presence of invalid GBIC or SFP modules
R = LAN PHY; W = WAN PHY
Switch(config)#errdisable detect cause gbic-invalid
300 seconds
Switch#show errdisable recovery

43. Enables automatic re-enabling of error-disabled ports
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
IEEE 802.3ae
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config-if)#shutdown

44. What is 1000BASE-CX?
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Interconnecting switches in a campus network
The Drop adjacency

45. What is the maximum cabling distance for 1000BASE-CX?
25 metres
Cabling specifications for 10 Gigabit Ethernet
They are dropped (ARP throttling)
Switch(config)#default interface {interface}

46. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Dynamic
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Trunk
SC fibre optic or RJ-45 UTP

47. Enables error-disable when a link is seen to be unidirectional
400 metres half duplex and 2000 metres full duplex
Switch(config)#errdisable detect cause udld
Switch(config-if)#switchport access vlan {vlan}
Switch#show interfaces status err-disabled

48. What is a GigaStack GBIC?
Switch(config)#errdisable detect cause arp-inspection
Accelerated CEF (aCEF)
10GbE operates only at full duplex
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance

49. What is the timer range for automatic re-enabling of error-disabled ports?
The Drop adjacency
From 30 seconds to 86 -400 seconds (24 hours)
Switch(config-if)#no switchport
300 seconds

50. What is the default timer for automatic re-enabling of error-disabled ports?
LOU registers
300 seconds
Half duplex
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)