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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 extended IP access list using TCP/UDP?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
Interconnecting switches in a campus network
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
A switch port that has been shut down automatically due to a serious error condition

2. Adds a description to an interface configuration
Switch(config-if)#description {string}
Process the first packet in a traffic flow to determine the destination
Tunnel
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)

3. What are the common PMD types for 10 Gigabit Ethernet?
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Wide-Wavelength Division Multiplexing
Source MAC address; Port of arrival; VLAN; Time stamp
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

4. What is the default age-out time for stale entries in the CAM table?
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Static access
Switch(config)#errdisable recovery cause {all | {cause-name}}
300 seconds

5. What is a GigaStack GBIC?
15 metres
Static access
A proprietary connector with a high-data-rate copper cable with enhanced signal integrity and EMI performance
Switch(config)#errdisable detect cause loopback

6. What is the maximum cabling distance for 10GBASE-SR/SW?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Carrier Sense Multiple Access Collision Detection
In parallel revealing the best (longest) match in a single table lookup
10GbE operates only at full duplex

7. Enables error-disable for errors with dynamic ARP inspection
Switch(config-if)#shutdown
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch(config)#errdisable detect cause arp-inspection

8. Displays dynamic CAM table entries
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
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
In parallel revealing the best (longest) match in a single table lookup
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

9. Enables error-disable for errors related to 802.1x security
A switch port that has been shut down automatically due to a serious error condition
300 seconds
Switch(config)#errdisable detect cause security-violation
Switch#show cef drop

10. What is WAN PHY used for?
550 metres for 50 or 62.5 micron MMF; 10 km for 9 micron SMF
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks
Switch(config-if)#speed {10 | 100 | 1000 | auto}
The CEF entry version number

11. What is 10GBASE-CX4?
Switch(config)#default interface {interface}
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Multilayer Switching
Switch(config)#errdisable detect cause dhcp-rate-limit

12. What is half duplex operation?

13. What function is performed by the Switching Database Manager (SDM)?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Switch(config-if)#description {string}
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

14. What is LAN PHY used for?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
300 seconds
Interconnecting switches in a campus network
Switch(config)#errdisable detect cause loopback

15. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch#show ip cef {interface} [detail]
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
CEF punt

16. What are the reasons for packets being dropped by CEF?
In parallel revealing the best (longest) match in a single table lookup
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
With a mask value in addition to binary values to decide which keys in a table are relevant

17. What are runts?
Packets that have been truncated before they were fully received
Switch#show ip cef
Compiling Access Control Entries (ACE) into the TCAM table
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

18. What function is performed by the Feature Manager (FM)?
Collision domain
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
Accelerated CEF (aCEF)
Compiling Access Control Entries (ACE) into the TCAM table

19. What is 1000BASE-SX?
The switch port falls back to default setting of half duplex
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
On
Switch#show mac address-table dynamic [address {mac-address}] [interface {interface}] [vlan {vlan}]

20. What combinations are TCAM entries composed of?
Switched virtual interface (SVI)
Interconnecting switches in a campus network
Value - Mask - and Result (VMR)
Multilayer Switching

21. What RJ-45 pins must be swapped in a Category 5 UTP crossover cable for Gigabit Ethernet?
Switch(config)#errdisable detect cause storm-control
Configure the appropriate values manually on both ends of the link
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
400 metres half duplex and 2000 metres full duplex

22. What is the content of TCAM Result entries?
Switch(config)#errdisable detect cause rootguard
Numeric values that represent what action to take after the TCAM lookup occurs
Interconnecting switches in a campus network
Switch#show adjacency [{interface}] [summary | detail]

23. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
Switch(config)#errdisable detect cause rootguard
UTP Fast Ethernet and Gigabit Ethernet
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

24. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
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 status err-disabled
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
A switch port that has been shut down automatically due to a serious error condition

25. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch#show running-config interface {interface}
Store-and-forward

26. What is ANSI?
Down - static access - trunk or tunnel
American National Standards Institute
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Forwarding Information Base

27. What is the standard for Gigabit Ethernet (1000 Mbps)?
American National Standards Institute
IEEE 802.3z
Manually by administratively disabling and re-enabling the port
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)

28. What is the role of a Route Processor (RP) in first generation MLS?
Switch(config)#errdisable detect cause rootguard
Switch#show cef not-cef-switched
Process the first packet in a traffic flow to determine the destination
Switch(config)#mac address-table aging-time {seconds}

29. What is the TCAM Value and Mask for an IP access list?
Trunk
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8)
Ternary Content-Addressable Memory
Switch(config)#errdisable detect cause security-violation

30. What is the DTP negotiation mode of a switch port configured as dynamic?
Switch(config)#errdisable recovery cause {all | {cause-name}}
On
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Static access or trunk

31. What are the types of layer 3 switched interfaces
Switch#show interfaces {interface}
SVI or native routed interface
SC or MT-RJ
Off

32. What is the operational mode of a switch port that uses DTP negotiation?
Static access or trunk
Electromagnetic Interference
Switch(config)#interface range macro {name}
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

33. What are the common cabling specifications for Fast Ethernet?
Compiling Access Control Entries (ACE) into the TCAM table
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)
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#errdisable detect cause bpduguard

34. What is CAM?
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Content-Addressable Memory
UTP Fast Ethernet and Gigabit Ethernet
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

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

36. What is the default duplex mode of a Fast Ethernet interface?
25 metres
Stations can transmit and receive at the same time because switched Ethernet removes the possibility of collisions
Half duplex
Trunk or dynamic

37. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#errdisable detect cause udld
Tunnel
Collision domain

38. What is the timer range for automatic re-enabling of error-disabled ports?
From 30 seconds to 86 -400 seconds (24 hours)
Tunnel
CEF glean
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

39. What is the DTP negotiation mode of a switch port configured as static access?
IEEE 802.3u
100 metres
Switch(config-if)#switchport mode access
Off

40. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
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
Tunnel
Full duplex
Switch(config-if)#no switchport

41. What is 100BASE-T4?
Switch#show ip cef
Switch(config)#errdisable detect cause security-violation
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

42. What are GigaStack GBICs used for?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
IEEE 802.3z
Switch(config)#errdisable detect cause ilpower
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

43. Enables error-disable for rate-limiting of DHCP snooping
Switch(config)#errdisable detect cause pagp-flap
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#errdisable detect cause dhcp-rate-limit
A switch port that has been shut down automatically due to a serious error condition

44. How is the TCAM organised?
By Mask/Value - where each unique mask has eight value patterns associated with it
The Layer 3 engine
Switch#show interfaces status err-disabled
70 km for 9 micron SMF; 100 km for 8 micron SMF

45. Enables error-disable when the Port Aggregation Protocol (PAgP) is flapping
Switch(config)#errdisable detect cause pagp-flap
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
On
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

46. What is the name of physical network segment where data packets can collide with one another when being sent?
Collision domain
300 seconds
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
IEEE 802.3ab

47. Where is source and destination addresses and other relevant protocol information for access lists stored in the TCAM table?
IEEE 802.3
Switch(config)#errdisable detect cause loopback
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself
In TCAM Value entries

48. What information is recorded in CAM as frames arrive on a switch port?
Source MAC address; Port of arrival; VLAN; Time stamp
Numeric values that represent what action to take after the TCAM lookup occurs
Switch(config)#errdisable detect cause storm-control
Switch(config)#no ip cef

49. What is EMI?
Ternary Content-Addressable Memory
Electromagnetic Interference
10GBASE-SR/SW - 10GBASE-LR/LW - 10GBASE-ER/EW - 10GBASE-LX4/LW4 - 10GBASE-CX4
Packets that have been truncated before they were fully received

50. What is 1000BASE-X?
Switch(config-if)#no switchport
Multilayer Switching
Cabling specifications for Gigabit Ethernet
Switch(config)#errdisable detect cause security-violation