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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. When should CEF be disabled?
40 km
The table of learned MAC addresses - ports - and VLAN information
100 metres
Only temporarily for debugging purposes

2. What are the basic operations that a frame undergoes as it passes through a Layer 2 switch?
Switch(config)#errdisable recovery interval {seconds}
Ingress queueing; Destination MAC lookup (CAM); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Egress queueing
300 seconds
Switch(config)#interface range macro {name}

3. What is 100BASE-TX?
On
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP

4. What is CSMA/CD?
Carrier Sense Multiple Access Collision Detection
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch#show interfaces {interface} switchport
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)

5. What CEF adjacency is used when packets must be sent to the Layer 3 engine for further processing?
S = Short; L = Long; E = Extra-long
The Punt adjacency
In TCAM Value entries
The table of learned MAC addresses - ports - and VLAN information

6. What is 10GBASE-SR/SW?
Switch(config)#interface range macro {name}
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
Switch(config)#interface {type}{module}/{number}
Switch#show interfaces status err-disabled

7. What is 1000BASE-T?
Switched virtual interface (SVI)
Wide-Wavelength Division Multiplexing
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

8. What CEF adjacency is used to discard packets because of access list or other policy action?
Full duplex only
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
The Discard adjacency
Manually by administratively disabling and re-enabling the port

9. What are the duplex modes of a GigaStack GBIC?
Switch(config)#errdisable detect cause udld
IEEE 802.3u
300 seconds
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used

10. Resets the configuration of a switch port to its default values
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#default interface {interface}
Flooding a frame with unknown destination MAC address out all ports assigned to the source port VLAN except the source port itself

11. What is the standard for 10 Gigabit Ethernet (10GbE)?
LOU registers
IEEE 802.3ae
IEEE 802.3z
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

12. What denotes the number of times a CEF entry has been updated since the CEF table was created?
Compiling Access Control Entries (ACE) into the TCAM table
Switch(config)#no ip cef
The CEF entry version number
10 Gigabit Ethernet over copper CX4 with Infiniband connectors

13. Configures a switch port with a static access VLAN assignment
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
Value - Mask - and Result (VMR)
Switch(config-if)#switchport access vlan {vlan}
1 -2 on one end with 3 -6 on the other end

14. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
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
Switched virtual interface (SVI)
The table of learned MAC addresses - ports - and VLAN information
Compiling Access Control Entries (ACE) into the TCAM table

15. What combinations are TCAM entries composed of?
Value - Mask - and Result (VMR)
10GbE operates only at full duplex
The Discard adjacency
On

16. Disables a switch port
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Switch(config-if)#shutdown
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
1 -2 on one end with 3 -6 on the other end

17. Enables error-disable for conditions that trigger unicast flood blocking on a port
Switch(config)#errdisable detect cause unicast-flood
FIB with adjacency table
Native routed interface
Switch(config-if)#duplex {auto | full | half}

18. How does topology based switching work?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
Switch#show running-config interface {interface}
Tunnel
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

19. Displays administrative and operational status for a specified interface
Switch#show interfaces {interface}
Feature Manager (FM) and Switching Database Manager (SDM)
Switch(config)#errdisable detect cause vmps
On

20. What is the TCAM Value and Mask for an IGMP access list?
Source IP (/32); Destination IP (/32); Protocol (/16); IP ToS (/8); IGMP message type (/8)
Source IPX network (/32); Destination IPX network (/32); Destination node (/48); IPX packet type (/16)
300 seconds
Collision domain

21. Enables error-disable when a storm control threshold has been exceeded on a port
IEEE 802.3ae
Routing table and ARP table
Switch(config)#errdisable detect cause storm-control
When one station transmits at the same time as another on a shared medium

22. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
LAN PHY and WAN PHY
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
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Enable error-disable for all possible causes

23. How are ports that are in error-disable state re-enabled by default?
LC - MT-RJ or RJ-45
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Manually by administratively disabling and re-enabling the port
Switch(config-if)#duplex {auto | full | half}

24. What is the default duplex mode of a Gigabit Ethernet interface?
Full duplex
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
FIB with adjacency table
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance

25. Displays CEF Punt statistics with number of packets and reason for each line card
Switch#show cef not-cef-switched
Routing table and ARP table
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause bpduguard

26. What is 1000BASE-CX?
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
Switch(config)#default interface {interface}
Gigabit Ethernet over 1 pair Shielded Twisted Pair (STP) cabling
Route caching and topology based

27. Selects an interface-range macro and enters interface configuration mode
Switch(config)#interface range macro {name}
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
Only temporarily for debugging purposes
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

28. Displays error-disabled detection status
Switch#show errdisable detect
Institute of Electrical and Electronics Engineers
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Logical Operation Unit

29. What is CEF?
The CEF epoch number
Switch#show errdisable detect
Cisco Express Forwarding
Switch(config)#errdisable detect cause security-violation

30. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config)#interface {type}{module}/{number}
LC - MT-RJ or RJ-45
Switch(config)#errdisable detect cause channel-misconfig

31. Specifies the timer for automatic re-enabling of error-disabled ports
Tunnel
SC fibre optic or RJ-45 UTP
Switch(config)#errdisable recovery interval {seconds}
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

32. Enables error-disable for the presence of invalid GBIC or SFP modules
Switch(config)#errdisable detect cause gbic-invalid
Switch#show interfaces status
CEF glean
Switch#show ip cef {interface} [detail]

33. Displays entries in the Forwarding Information Base (FIB) for a specific subnet
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
Switch(config)#errdisable detect cause udld
Cabling specifications for Gigabit Ethernet
SVI

34. What are the common cabling specifications for Fast Ethernet?
Compiling Access Control Entries (ACE) into the TCAM table
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Only temporarily for debugging purposes
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

35. What is the content of TCAM Mask entries?

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36. What function is performed by the Feature Manager (FM)?
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
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
Compiling Access Control Entries (ACE) into the TCAM table
Cisco Express Forwarding

37. What is 10GBASE-X?
Manually by administratively disabling and re-enabling the port
Cabling specifications for 10 Gigabit Ethernet
LOU registers
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

38. What is the maximum cabling distance for 10GBASE-LR/LW?
Switch(config-if)#switchport mode access
10 km
IEEE 802.3u
IEEE 802.3ab

39. What is TCAM overflow?
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
CEF glean
Switch(config)#mac address-table aging-time {seconds}
They are dropped (ARP throttling)

40. Changes an interface to a layer 3 interface and erases all layer 2 interface configurations
Switch(config)#errdisable recovery interval {seconds}
Fast Ethernet over 2 pairs EIA/TIA Category 5 UTP
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config-if)#no switchport

41. What is the name of a Layer 3 physical interface on a switch?
Native routed interface
Dynamic
Down - static access - trunk or tunnel
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

42. 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(config)#errdisable detect cause storm-control
On
Trunk

43. What is the name of the CEF engine that maintains routing information in software?
Switch#show interfaces status
The Layer 3 engine
UTP Fast Ethernet and Gigabit Ethernet
Content-Addressable Memory

44. What is the operational mode of a switch port that carries traffic for multiple VLANs?
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP
American National Standards Institute
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Trunk

45. What happens to subsequent packets destined for FIB entries in CEF glean state?
Only temporarily for debugging purposes
Switch(config-if)#description {string}
A three-fold combination of 0 - 1 and X (don't care)
They are dropped (ARP throttling)

46. What tables are maintained by the CEF Layer 3 forwarding engine?
Static access - trunk - tunnel or dynamic
CEF punt
FIB with adjacency table
100 metres

47. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
Switch(config)#errdisable detect cause link-flap
Switch(config)#errdisable recovery cause {all | {cause-name}}
Forwarding Information Base

48. What is the standard for Fast Ethernet (100 Mbps)?
IEEE 802.3u
15 metres
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding
Switch(config)#errdisable detect cause link-flap

49. Displays the CAM table size with number of MAC addresses
Full duplex
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Native routed interface
Static access or dynamic

50. Adds a description to an interface configuration
Switch(config-if)#description {string}
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
Switched virtual interface (SVI)
Content-Addressable Memory