9th Lecture - Networking

[Pilla Zamindar]

[quote author=k2s link=topic=243110.msg3040613#msg3040613 date=1317158289]
naa profile lo topics lo vethuku baa...
else for some time ..... after the class , will PM u the links
[/quote]
ne profile lo posts vetukutey anni kastam baa....roju ki 15 pages vuntaunayi...after class naku pm chesina parla thank u..

[k2s]

[quote author=k2s link=topic=243110.msg3040577#msg3040577 date=1317157852]
Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? (Choose three)

[img]http://www.9tut.com/images/ccna/STP/STP_designated_port.jpg[/img]


A. Switch A – Fa0/0
B. Switch A – Fa0/1
C. Switch B – Fa0/0
D. Switch B – Fa0/1
E. Switch C – Fa0/0
F. Switch C – Fa0/1
[/quote]

answer : First by comparing their MAC addresses we learn that switch B will be root bridge as it has lowest MAC. Therefore all of its ports are designated ports -> C & D are correct.

On the link between switch A & switch C there must have one designated port and one non-designated (blocked) port. We can figure out which port is designated port by comparing their MAC address again. A has lower MAC so Fa0/1 of switch A will be designated port while Fa0/1 of switch C will be blocked ->  B is correct.

[k2s]

[quote author=Pilla Zamindar link=topic=243110.msg3040621#msg3040621 date=1317158417]
ne profile lo posts vetukutey anni kastam baa....roju ki 15 pages vuntaunayi...after class naku pm chesina parla thank u..
[/quote]posts lo kadu...... topics aney tab lo chudu

[k2s]

[quote author=shakkku link=topic=243110.msg3040611#msg3040611 date=1317158245]
switch B thakuva MAC undi kabati adi root avuthundi, so daani ports root ports avuthai, switch A MAC switch C kana ekuva undi kabati veetivi desg ports avuthai,  correct ena  sCo_^Y sCo_^Y sCo_^Y
[/quote] @3$% @3$%

confuse ayyavu...... top switch is B not A........

[k2s]

[quote author=k2s link=topic=243110.msg3040608#msg3040608 date=1317158201]
Which is what :

[img]http://www.certprepare.com/images/SWITCH/DragAndDrop/STP_process.jpg[/img]
[/quote]

answer : 1) Listening: sends and receives BPDUs to determine root, but does not update the MAC address table.
2) Disabled: does not participate in frame forwarding or in STP.
3) Blocking: does not participate in frame forwarding.
4) Fowarding: sends and receives data frames.
5) Learning: populates the MAC address table, but will not forward user data.

Notice: A port begins its life in a Disabled state, moving through several passive states and, finally, into an active state if allowed to forward traffic.

[k2s]

[quote author=shakkku link=topic=243110.msg3040579#msg3040579 date=1317157875]

STP okate anukunta
[/quote]


STP is IEEE 802.1D  ^G#W
so A & D

[k2s]

Ok guys...... I am continuing with next topic.... RSTP:


Rapid STP (IEEE 802.1w)


RSTP (802.1w) works just like STP (802.1d) in several ways:
■ It elects the root switch using the same parameters and tiebreakers.
■ It elects the root port on nonroot switches with the same rules.
■ It elects designated ports on each LAN segment with the same rules.
■ It places each port in either Forwarding or Blocking State, although RSTP calls the
  Blocking State the Discarding State.

the reason to go RSTP is convergence. STP takes a relatively long time to
converge (50 seconds with the default settings). RSTP improves network convergence
when topology changes occur.

[k2s]

RSTP improves convergence by either eliminating or significantly reducing the waiting
periods that 802.1d STP needs to avoid loops during convergence. 802.1d STP requires a
waiting period of MaxAge (default 20 seconds) before reacting to some events, whereas
RSTP only has to wait 3*Hello (default 6 seconds). Additionally, RSTP eliminates the
forward delay (default 15 seconds) time in both Listening and Learning States. Traditional
STP convergence has essentially three time periods, each of which RSTP improves upon.
These three waiting periods of (by default) 20, 15, and 15 seconds create 802.1d STP’s
relatively slow convergence, and the reduction or elimination of these waiting periods
makes RSTP convergence occur quickly.


RSTP convergence times are typically less than 10 seconds. In some cases, they can be as
low as 1 to 2 seconds. The following sections explain the terminology and processes used
by RSTP to overcome the shortcomings of 802.1d STP and improve convergence time.

[k2s]

RSTP and STP Port States


Operational State              STP State (802.1d)                                  RSTP State                    Forwards Data Frames in This State?
                                                                                                          (802.1w)

Enabled                                Blocking                                                    Discarding                                  No
Enabled                                  Listening                                                  Discarding                                  No
Enabled                                    Learning                                                Learning                                      No
Enabled                                  Forwarding                                            Forwarding                                  Yes
Disabled                                    Disabled                                              Discarding                                      No

[k2s]

RSTP and STP Port Roles


RSTP Role                    STP Role                                Definition

Root port                  Root port                                A single port on each nonroot switch in which the switch
                                                                                hears the best BPDU out of all the received BPDUs

Designated port        Designated port                    Of all switch ports on all switches attached to the same
                                                                                segment/collision domain, the port that advertises the
                                                                              “best” BPDU

Alternate port                  —                                      A port on a switch that receives a suboptimal BPDU

Backup port                    —                                      A nondesignated port on a switch that is attached to the
                                                                                same segment/collision domain as another port on the
                                                                                same switch

Disabled                          —                                    A port that is administratively disabled or is not capable of
                                                                                working for other reasons

[k2s]

4 Members and 3 Guests are viewing this topic.
andulo okadini nenu  &*B@

[CaliStar]

[quote author=k2s link=topic=243110.msg3040673#msg3040673 date=1317159706]
4 Members and 3 Guests are viewing this topic.
andulo okadini nenu  &*B@
[/quote]
F@#da F@#da

[k2s]

any doubts.... [img]http://lh3.ggpht.com/-p1xL5q8Ux-4/TmBT970zOXI/AAAAAAAAD-A/rj1T9vsNltw/Ali.gif[/img]

[ToughGuy]

[quote author=Pilla Zamindar link=topic=243110.msg3040606#msg3040606 date=1317158186]
*=: *=: *=: *=: nenu ipudey chustuna apudey 9 aypoyaya..migilina 8 lecturer class ekada vunayo links ivava.... CITI#H@ CITI#H@ CITI#H@
[/quote]

here you go mate

Doubts:
[url=http://andhrafriends.com/index.php?topic=231694.msg2872329#msg2872329]http://andhrafriends.com/index.php?topic=231694.msg2872329#msg2872329[/url]


Lecture:
[url=http://andhrafriends.com/index.php?topic=231693.msg2872321#msg2872321]http://andhrafriends.com/index.php?topic=231693.msg2872321#msg2872321[/url]


[url=http://andhrafriends.com/index.php?topic=232200.0]http://andhrafriends.com/index.php?topic=232200.0[/url]

[url=http://andhrafriends.com/index.php?topic=234570.0]http://andhrafriends.com/index.php?topic=234570.0[/url]

[url=http://andhrafriends.com/index.php?topic=236491.0]http://andhrafriends.com/index.php?topic=236491.0[/url]

[url=http://andhrafriends.com/index.php?topic=236864.0]http://andhrafriends.com/index.php?topic=236864.0[/url]

[url=http://andhrafriends.com/index.php?topic=237390.0]http://andhrafriends.com/index.php?topic=237390.0[/url]

[url=http://andhrafriends.com/index.php?topic=237832.0]http://andhrafriends.com/index.php?topic=237832.0[/url]

[url=http://andhrafriends.com/index.php?topic=239473.0]http://andhrafriends.com/index.php?topic=239473.0[/url]

[url=http://andhrafriends.com/index.php?topic=243110.0]http://andhrafriends.com/index.php?topic=243110.0[/url]

S%Hi S%Hi

[k2s]

[quote author=!!!! FeRRo !!!! link=topic=243110.msg3040705#msg3040705 date=1317160669]
here you go mate

Doubts:
[url=http://andhrafriends.com/index.php?topic=231694.msg2872329#msg2872329]http://andhrafriends.com/index.php?topic=231694.msg2872329#msg2872329[/url]


Lecture:
[url=http://andhrafriends.com/index.php?topic=231693.msg2872321#msg2872321]http://andhrafriends.com/index.php?topic=231693.msg2872321#msg2872321[/url]


[url=http://andhrafriends.com/index.php?topic=232200.0]http://andhrafriends.com/index.php?topic=232200.0[/url]

[url=http://andhrafriends.com/index.php?topic=234570.0]http://andhrafriends.com/index.php?topic=234570.0[/url]

[url=http://andhrafriends.com/index.php?topic=236491.0]http://andhrafriends.com/index.php?topic=236491.0[/url]

[url=http://andhrafriends.com/index.php?topic=236864.0]http://andhrafriends.com/index.php?topic=236864.0[/url]

[url=http://andhrafriends.com/index.php?topic=237390.0]http://andhrafriends.com/index.php?topic=237390.0[/url]

[url=http://andhrafriends.com/index.php?topic=237832.0]http://andhrafriends.com/index.php?topic=237832.0[/url]

[url=http://andhrafriends.com/index.php?topic=239473.0]http://andhrafriends.com/index.php?topic=239473.0[/url]

[url=http://andhrafriends.com/index.php?topic=243110.0]http://andhrafriends.com/index.php?topic=243110.0[/url]

S%Hi S%Hi
[/quote] sHa_clap4 sHa_clap4