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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 automatic re-enabling of error-disabled ports
R = LAN PHY; W = WAN PHY
Switch(config)#errdisable detect cause unicast-flood
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch(config)#errdisable detect cause dtp-flap

2. What are the common PMD types for 10 Gigabit Ethernet?
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Switch#show adjacency [{interface}] [summary | detail]
Accelerated CEF (aCEF)
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4

3. What RJ-45 pins have been swapped in a Category 5 UTP crossover cable for Fast Ethernet?
1 -2 on one end with 3 -6 on the other end
1000BASE-T full duplex followed by 1000BASE-T half duplex
Packets that have been truncated before they were fully received
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

4. What are the common cabling specifications for Fast Ethernet?
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config-if)#no switchport
Process the first packet in a traffic flow to determine the destination
Collision domain

5. What are the operational modes of a Layer 2 switched interface?
400 metres half duplex and 2000 metres full duplex
Down - static access - trunk or tunnel
By Mask/Value - where each unique mask has eight value patterns associated with it
LC - MT-RJ or RJ-45

6. What information is stored in CAM?
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
The table of learned MAC addresses - ports - and VLAN information
A three-fold combination of 0 - 1 and X (don't care)
SVI or native routed interface

7. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Cisco Express Forwarding
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
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
Switch(config)#errdisable detect cause pagp-flap

8. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
SC or MT-RJ
Enable error-disable for all possible causes
Switch(config)#errdisable detect cause psecure-violation

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

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10. What is the standard for Gigabit Ethernet (1000 Mbps)?
Switch#show interfaces status
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
A name assigned to a ranges of interfaces
IEEE 802.3z

11. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switched virtual interface (SVI)
The Punt adjacency
CEF glean

12. What is the maximum cabling distance for 1000BASE-LX/LH?
Switch(config-if)#no ip route-cache cef
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
Switch(config)#interface range macro {name}
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF

13. What is 100BASE-T4?
The switch port falls back to default setting of half duplex
10 km
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
1 -2 on one end with 3 -6 on the other end

14. What is 100BASE-FX?
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)
Routing table and ARP table
The Discard adjacency
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

15. Displays administrative and operational status for a specified interface
Trunk
Store-and-forward
Off
Switch#show interfaces {interface}

16. What is full duplex operation?
From 30 seconds to 86 -400 seconds (24 hours)
IEEE 802.3z
SC or MT-RJ
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions

17. Displays the entire Forwarding Information Base (FIB)
The Layer 3 engine
Switch#show ip cef
Half duplex
Switch#show interfaces {interface} switchport

18. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
CEF glean
Full duplex only
Manually by administratively disabling and re-enabling the port
Switch(config)#errdisable detect cause arp-inspection

19. Enables error-disable for errors with offering inline power
UTP Fast Ethernet and Gigabit Ethernet
Carrier Sense Multiple Access Collision Detection
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause ilpower

20. Enables error-disable when trunking encapsulation is flapping from one type to another
XENPAK - X2 - or SFP+
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Switch(config)#errdisable detect cause dtp-flap
The CEF entry version number

21. What is the TCAM Value and Mask for an IGMP access list?
Switch(config)#errdisable detect cause dhcp-rate-limit
300 seconds
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

22. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch#show interfaces status
Switch(config)#errdisable detect cause vmps
A station must wait its turn to transmit; it can't transmit and receive at the same time
Security and QoS ACLs

23. What is the name of the CEF engine that maintains routing information in software?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
The Layer 3 engine
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable recovery interval {seconds}

24. 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
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)
Security and QoS ACLs
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)

25. What tables are maintained by the CEF Layer 3 engine?
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Routing table and ARP table
With a mask value in addition to binary values to decide which keys in a table are relevant
Electromagnetic Interference

26. What are the Fast Ethernet autonegotiation selection priorities?
Switch(config)#errdisable detect cause udld
In parallel revealing the best (longest) match in a single table lookup
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
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

27. What is CAM?
Bundling together two to eight full duplex Fast Ethernet links to act as a single physical link
Switch(config)#errdisable detect cause link-flap
Content-Addressable Memory
Trunk

28. What denotes the number of times a CEF entry has been updated since the CEF table was created?
LC - MT-RJ or RJ-45
The CEF entry version number
70 km for 9 micron SMF; 100 km for 8 micron SMF
A name assigned to a ranges of interfaces

29. Displays static CAM table entries
Gigabit Interface Converter (GBIC) or Small Form factor Pluggable (SFP)
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause security-violation
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

30. Enables error-disable for misconfiguration of EtherChannel bundles
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#errdisable detect cause channel-misconfig
Cisco Express Forwarding
Switch(config)#errdisable detect cause dtp-flap

31. What mechanism does the TCAM provide for Layer 4 comparisons involving gt - lt - neq or range operators?
LOU registers
Switch#show cef drop
LAN PHY and WAN PHY
70 km for 9 micron SMF; 100 km for 8 micron SMF

32. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Native routed interface
Switch(config)#errdisable detect cause bpduguard
IEEE 802.3ab

33. What is the TCAM Value and Mask for an IP access list?
Routing table and ARP table
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Switch(config)#errdisable detect cause udld
Tunnel

34. What is 1000BASE-ZX?
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause channel-misconfig
The CEF entry version number
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)

35. What are the names of the two basic generations of MLS?
Source MAC address; Port of arrival; VLAN; Time stamp
Route caching and topology based
Trunk or dynamic
Institute of Electrical and Electronics Engineers

36. What are GigaStack GBICs used for?
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#errdisable detect cause gbic-invalid
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing

37. Sets the duplex mode of an Ethernet or Fast Ethernet interface
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 ilpower
400 metres half duplex and 2000 metres full duplex
Switch(config-if)#duplex {auto | full | half}

38. What is Cisco's old recommendation regarding switch port speed and duplex mode?
From 30 seconds to 86 -400 seconds (24 hours)
Configure the appropriate values manually on both ends of the link
The Discard adjacency
Electromagnetic Interference

39. How are ternary combinations implemented?
With a mask value in addition to binary values to decide which keys in a table are relevant
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch(config)#interface range macro {name}
Enable error-disable for all possible causes

40. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Compiling Access Control Entries (ACE) into the TCAM table

41. Selects multiple switch port interfaces at the same time and enters interface configuration mode
10GbE operates only at full duplex
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
By Mask/Value - where each unique mask has eight value patterns associated with it
Switch(config-if)#no ip route-cache cef

42. 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)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Configure the appropriate values manually on both ends of the link
Content-Addressable Memory

43. Enables error-disable when a storm control threshold has been exceeded on a port
Switch(config)#errdisable detect cause gbic-invalid
Switch(config)#errdisable detect cause storm-control
Routing table and ARP table
10 km

44. How are ports that are in error-disable state re-enabled by default?
Static access - trunk - tunnel or dynamic
Switch(config)#errdisable detect cause storm-control
Manually by administratively disabling and re-enabling the port
Switch(config)#errdisable detect cause dtp-flap

45. Displays a list with status of all interfaces
Switch#show interfaces status
10GbE operates only at full duplex
Feature Manager (FM) and Switching Database Manager (SDM)
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

46. What tables are maintained by the CEF Layer 3 forwarding engine?
Store-and-forward
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Off
FIB with adjacency table

47. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config)#errdisable detect cause rootguard
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
Switch(config-if)#no switchport
On

48. What is 1000BASE-CX?
Switch(config)#errdisable detect cause psecure-violation
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
15 metres
Switch(config)#errdisable recovery cause {all | {cause-name}}

49. What are the common cabling specifications for Gigabit Ethernet?
Switch(config)#errdisable detect cause udld
Switch#show ip cef
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Forwarding Information Base

50. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
Switch#show adjacency [{interface}] [summary | detail]
Route caching and topology based
SVI or native routed interface